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Financial Statements of Parent Company Guarantor - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,802.5 us-gaap_SalesRevenueNet | $ 1,758.4 us-gaap_SalesRevenueNet | $ 1,834.1 us-gaap_SalesRevenueNet | $ 1,644.0 us-gaap_SalesRevenueNet | $ 1,831.0 us-gaap_SalesRevenueNet | $ 1,713.3 us-gaap_SalesRevenueNet | $ 1,791.7 us-gaap_SalesRevenueNet | $ 1,663.7 us-gaap_SalesRevenueNet | $ 7,039.0 us-gaap_SalesRevenueNet | $ 6,999.7 us-gaap_SalesRevenueNet | $ 4,306.8 us-gaap_SalesRevenueNet
Cost of goods sold |  |  |  |  |  |  |  |  | 4,576.0 us-gaap_CostOfGoodsSold | 4,629.6 us-gaap_CostOfGoodsSold | 3,040.9 us-gaap_CostOfGoodsSold
Gross profit | 627.9 us-gaap_GrossProfit | 624.7 us-gaap_GrossProfit | 646.3 us-gaap_GrossProfit | 564.1 us-gaap_GrossProfit | 630.5 us-gaap_GrossProfit | 614.7 us-gaap_GrossProfit | 627.4 us-gaap_GrossProfit | 497.5 us-gaap_GrossProfit | 2,463.0 us-gaap_GrossProfit | 2,370.1 us-gaap_GrossProfit | 1,265.9 us-gaap_GrossProfit
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,493.8 us-gaap_SellingGeneralAndAdministrativeExpense | 1,493.7 us-gaap_SellingGeneralAndAdministrativeExpense | 1,117.7 us-gaap_SellingGeneralAndAdministrativeExpense
Research and development |  |  |  |  |  |  |  |  | 117.3 us-gaap_ResearchAndDevelopmentExpense | 122.8 us-gaap_ResearchAndDevelopmentExpense | 92.3 us-gaap_ResearchAndDevelopmentExpense
Impairment of trade names |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges | 11.0 us-gaap_AssetImpairmentCharges | 60.7 us-gaap_AssetImpairmentCharges
Operating income (loss) | 176.0 us-gaap_OperatingIncomeLoss | 267.4 us-gaap_OperatingIncomeLoss | 226.4 us-gaap_OperatingIncomeLoss | 182.1 us-gaap_OperatingIncomeLoss | 241.3 us-gaap_OperatingIncomeLoss | 230.0 us-gaap_OperatingIncomeLoss | 204.9 us-gaap_OperatingIncomeLoss | 66.4 us-gaap_OperatingIncomeLoss | 851.9 us-gaap_OperatingIncomeLoss | 742.6 us-gaap_OperatingIncomeLoss | (4.8)us-gaap_OperatingIncomeLoss
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnInvestments | 0 us-gaap_GainLossOnInvestments | 0 us-gaap_GainLossOnInvestments
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0.2 us-gaap_GainLossOnSaleOfBusiness | (20.8)us-gaap_GainLossOnSaleOfBusiness | 0 us-gaap_GainLossOnSaleOfBusiness
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (75.4)us-gaap_GainsLossesOnExtinguishmentOfDebt
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | (1.2)us-gaap_IncomeLossFromEquityMethodInvestments | (2.0)us-gaap_IncomeLossFromEquityMethodInvestments | (2.3)us-gaap_IncomeLossFromEquityMethodInvestments
Interest income |  |  |  |  |  |  |  |  | (3.7)us-gaap_InterestIncomeOperating | (4.4)us-gaap_InterestIncomeOperating | (2.0)us-gaap_InterestIncomeOperating
Interest expense |  |  |  |  |  |  |  |  | 72.3 us-gaap_InterestExpense | 75.3 us-gaap_InterestExpense | 70.2 us-gaap_InterestExpense
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 784.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 694.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (146.1)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 177.3 us-gaap_IncomeTaxExpenseBenefit | 177.0 us-gaap_IncomeTaxExpenseBenefit | (67.2)us-gaap_IncomeTaxExpenseBenefit
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 607.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 517.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (78.9)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax | (9.0)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 1.6 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 2.3 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (1.3)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (3.9)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 7.8 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 15.5 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 6.5 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (6.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 25.9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | (25.7)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | (380.1)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | (5.6)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | (0.8)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | (385.7)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | (0.8)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 129.8 us-gaap_ProfitLoss | 192.5 us-gaap_ProfitLoss | 159.2 us-gaap_ProfitLoss | 125.5 us-gaap_ProfitLoss | 164.4 us-gaap_ProfitLoss | 166.4 us-gaap_ProfitLoss | 139.9 us-gaap_ProfitLoss | 46.8 us-gaap_ProfitLoss | 214.9 us-gaap_ProfitLoss | 542.6 us-gaap_ProfitLoss | (104.6)us-gaap_ProfitLoss
Noncontrolling interest |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 5.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to Pentair plc | 120.8 us-gaap_NetIncomeLoss | (186.0)us-gaap_NetIncomeLoss | 161.5 us-gaap_NetIncomeLoss | 118.6 us-gaap_NetIncomeLoss | 158.2 us-gaap_NetIncomeLoss | 172.8 us-gaap_NetIncomeLoss | 154.1 us-gaap_NetIncomeLoss | 51.7 us-gaap_NetIncomeLoss | 214.9 us-gaap_NetIncomeLoss | 536.8 us-gaap_NetIncomeLoss | (107.2)us-gaap_NetIncomeLoss
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  | 162.9 us-gaap_IncomeLossFromContinuingOperations | 165.0 us-gaap_IncomeLossFromContinuingOperations | 138.6 us-gaap_IncomeLossFromContinuingOperations | 45.2 us-gaap_IncomeLossFromContinuingOperations | 607.0 us-gaap_IncomeLossFromContinuingOperations | 511.7 us-gaap_IncomeLossFromContinuingOperations | (81.5)us-gaap_IncomeLossFromContinuingOperations
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | 214.9 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest | 542.6 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest | (104.6)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | (336.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | (29.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 31.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Amortization of pension and other post-retirement prior service cost |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | (0.4)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax | (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (3.6)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (121.8)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 512.8 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | (77.1)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 8.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 4.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (121.8)us-gaap_ComprehensiveIncomeNetOfTax | 504.8 us-gaap_ComprehensiveIncomeNetOfTax | (81.1)us-gaap_ComprehensiveIncomeNetOfTax
Parent Company Guarantor |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cost of goods sold |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gross profit |  |  |  |  |  |  |  |  | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 25.3 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21.0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Research and development |  |  |  |  |  |  |  |  | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Impairment of trade names |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss) |  |  |  |  |  |  |  |  | (25.3)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (21.0)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5.0)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | (615.5)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (539.0)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 75.7 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income |  |  |  |  |  |  |  |  | 0 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 0.7 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5.6 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.1 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 589.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 512.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (80.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (17.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.7 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.7 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 607.0 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 511.7 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (81.5)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | (392.1)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25.1 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (25.7)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 536.8 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (107.2)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | 214.9 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 536.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (107.2)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  | 511.7 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (81.5)us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | 214.9 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 536.8 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (107.2)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | (336.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (31.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30.0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of pension and other post-retirement prior service cost |  |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3.6)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 504.8 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (81.1)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (121.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 504.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (81.1)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Gross profit |  |  |  |  |  |  |  |  | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Selling, general and administrative |  |  |  |  |  |  |  |  | 2.6 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Research and development |  |  |  |  |  |  |  |  | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (2.6)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | (619.7)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Interest income |  |  |  |  |  |  |  |  | 0 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Interest expense |  |  |  |  |  |  |  |  | 2.1 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 615.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (0.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 615.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | (392.1)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  | (25.7)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | 223.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | 223.4 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | (336.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (113.3)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Subsidiary Issuer |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Cost of goods sold |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Gross profit |  |  |  |  |  |  |  |  | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 7.7 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 13.3 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (3.8)us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Research and development |  |  |  |  |  |  |  |  | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Impairment of trade names |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Operating income (loss) |  |  |  |  |  |  |  |  | (7.7)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (13.3)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 3.8 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | (611.1)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (508.6)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 76.6 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Interest income |  |  |  |  |  |  |  |  | (92.3)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (99.2)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (9.2)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Interest expense |  |  |  |  |  |  |  |  | 95.6 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 106.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 10.2 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 600.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 488.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (73.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (2.4)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 1.4 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 1.1 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 602.5 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 487.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (74.9)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember |
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | (392.1)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 25.1 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 512.2 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (100.6)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Net income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | 210.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 512.2 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (100.6)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  | 487.1 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (74.9)us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | 210.4 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 512.2 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (100.6)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | (336.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (31.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 30.0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Amortization of pension and other post-retirement prior service cost |  |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (3.6)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 480.2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (74.5)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (126.3)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | 480.2 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember | (74.5)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_SubsidiaryIssuerMember
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,039.0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 6,999.7 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,306.8 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cost of goods sold |  |  |  |  |  |  |  |  | 4,576.0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4,629.6 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 3,040.9 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Gross profit |  |  |  |  |  |  |  |  | 2,463.0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,370.1 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,265.9 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,458.2 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,459.4 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,116.5 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Research and development |  |  |  |  |  |  |  |  | 117.3 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 122.8 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 92.3 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Impairment of trade names |  |  |  |  |  |  |  |  |  | 11.0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 60.7 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Operating income (loss) |  |  |  |  |  |  |  |  | 887.5 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 776.9 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3.6)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0.2 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (20.8)us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  | (75.4)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | (1.2)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2.0)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2.3)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest income |  |  |  |  |  |  |  |  | (40.2)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (53.4)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2.0)us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense |  |  |  |  |  |  |  |  | 102.7 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 111.9 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 69.1 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | 826.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 741.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (143.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 197.7 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 174.9 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (69.0)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 628.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 566.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (74.8)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | (6.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 25.9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (25.7)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | (385.7)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (0.8)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 51.4 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 591.4 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (100.5)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Noncontrolling interest |  |  |  |  |  |  |  |  |  | 5.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | 236.2 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 585.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (103.1)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  | 560.5 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (77.4)us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | 236.2 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 591.4 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (100.5)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | (336.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (29.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 31.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Amortization of pension and other post-retirement prior service cost |  |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | (0.4)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (0.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (3.6)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 561.6 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (73.0)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 8.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 4.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (100.5)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 553.6 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (77.0)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SalesRevenueNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cost of goods sold |  |  |  |  |  |  |  |  | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Gross profit |  |  |  |  |  |  |  |  | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_GrossProfit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Research and development |  |  |  |  |  |  |  |  | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ResearchAndDevelopmentExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Impairment of trade names |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Operating income (loss) |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Loss (earnings) from investment in subsidiaries |  |  |  |  |  |  |  |  | 1,846.3 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 1,047.6 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (152.3)us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Loss (gain) on sale of businesses, net |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_GainLossOnSaleOfBusiness / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other (income) expense: |  |  |  |  |  |  |  |  |  |  |
Equity income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest income |  |  |  |  |  |  |  |  | 128.8 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 148.2 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 9.2 us-gaap_InterestIncomeOperating / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Interest expense |  |  |  |  |  |  |  |  | (128.8)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (148.2)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (9.2)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (loss) from continuing operations before income taxes and noncontrolling interest |  |  |  |  |  |  |  |  | (1,846.3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (1,047.6)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 152.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | (1,846.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (1,047.6)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 152.3 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |
Discontinued Operation, Income (Loss) from Investment in Subsidiaries |  |  |  |  |  |  |  |  | 1,176.3 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (50.2)pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 pnr_DiscontinuedOperationIncomeLossfromInvestmentinSubsidiaries / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (1,097.8)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 203.7 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | (670.0)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (1,097.8)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 203.7 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  | (1,047.6)us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 152.3 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  | (670.0)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (1,097.8)pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 203.7 pnr_IncomeLossFromContinuingOperationsBeforeMinorityInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Changes in cumulative translation adjustment |  |  |  |  |  |  |  |  | 1,008.9 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 62.6 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (60.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Amortization of pension and other post-retirement prior service cost |  |  |  |  |  |  |  |  |  | 0.8 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0.6 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Changes in market value of derivative financial instruments |  |  |  |  |  |  |  |  | 1.2 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0.6 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 7.2 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (1,033.8)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 151.5 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Less: Comprehensive income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income (loss) attributable to Pentair plc |  |  |  |  |  |  |  |  | $ 340.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (1,033.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ 151.5 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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