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Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 28, 2012 | Jan. 30, 2014 | Mar. 29, 2014 | Oct. 04, 2012 | Dec. 31, 2012
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $ 134.7 us-gaap_MinorityInterestDecreaseFromRedemptions |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |
Cost and expenses incurred in connection with acquisition |  | 8.2 us-gaap_BusinessCombinationAcquisitionRelatedCosts | 57.3 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |  |  |
Water Quality Systems [Member] |  |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |
Goodwill |  |  | 80.9 pnr_BusinessAcquisitionPurchasePriceAllocationGoodwill / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember |  |  |  |  | 80.9 pnr_BusinessAcquisitionPurchasePriceAllocationGoodwill / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember
Expected tax deductible goodwill |  |  | 67.1 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember |  |  |  |  | 67.1 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember
Purchase Price |  |  | 121.2 pnr_BusinessAcquisitionPurchasePrice / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember |  |  |  |  | 121.2 pnr_BusinessAcquisitionPurchasePrice / us-gaap_StatementBusinessSegmentsAxis = pnr_WaterQualitySystemsMember
Tyco Flow Control International, Ltd |  |  |  |  |  |  |  |
Material acquisitions |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  | 100.00%pnr_PercentageOfOwnershipInterests / us-gaap_BusinessAcquisitionAxis = pnr_TycoFlowControlBusinessMember |  |  |  |
Shares issued for stock acquisition |  |  |  | 110.9 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = pnr_TycoFlowControlBusinessMember |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Acquired Inventory |  |  | 156.2 pnr_FairValueAdjustmentOfAcquiredInventory / us-gaap_BusinessAcquisitionAxis = pnr_TycoFlowControlBusinessMember |  |  |  |  |
Pentair Residential Filtration [Member] |  |  |  |  |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Percentage Of Ownership Interest Acquired |  |  |  |  | 19.90%pnr_PercentageOfOwnershipInterestAcquired / us-gaap_BusinessAcquisitionAxis = pnr_PentairResidentialFiltrationMember |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  |  | 134.3 us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_BusinessAcquisitionAxis = pnr_PentairResidentialFiltrationMember |  |
Other acquisitions |  |  |  |  |  |  |  |
Percentage of ownership interests before acquisition |  |  |  |  | 80.10%pnr_PercentageOfOwnershipInterestsBeforeAcquisition / us-gaap_BusinessAcquisitionAxis = pnr_PentairResidentialFiltrationMember |  |  |
Pentair Middle East Holding S.a.r.l. |  |  |  |  |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Percentage Of Ownership Interest Acquired |  |  |  |  |  |  | 25.00%pnr_PercentageOfOwnershipInterestAcquired / us-gaap_BusinessAcquisitionAxis = pnr_PentairMiddleEastHoldingS.a.r.l.Member |
Other acquisitions |  |  |  |  |  |  |  |
Cash paid |  |  |  |  |  |  |  | 100.0 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = pnr_PentairMiddleEastHoldingS.a.r.l.Member
Percentage of ownership interests before acquisition |  |  |  |  |  |  | 75.00%pnr_PercentageOfOwnershipInterestsBeforeAcquisition / us-gaap_BusinessAcquisitionAxis = pnr_PentairMiddleEastHoldingS.a.r.l.Member |
Change In Control Of Company [Member] | Tyco Flow Control International, Ltd |  |  |  |  |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Acquisition related costs |  |  | 21.8 pnr_BusinessAcquisitionsProFormaNonrecurringAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = pnr_TycoFlowControlBusinessMember / us-gaap_IncomeStatementLocationAxis = pnr_ChangeInControlOfCompanyMember |  |  |  |  |
Transaction Costs [Member] | Tyco Flow Control International, Ltd |  |  |  |  |  |  |  |
Pro forma results of material acquisitions |  |  |  |  |  |  |  |
Acquisition related costs |  |  | $ 57.3 pnr_BusinessAcquisitionsProFormaNonrecurringAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = pnr_TycoFlowControlBusinessMember / us-gaap_IncomeStatementLocationAxis = pnr_TransactionCostsMember |  |  |  |  |

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- Definition Business Acquisition, Purchase Price + References No definition available. + Details
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- Definition Business Acquisition, Purchase Price Allocation, Goodwill + References No definition available. + Details
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- Definition This element represents the adjustment recorded to the acquired inventory during purchase accounting related to units sold during the period. + References No definition available. + Details
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- Definition Percentage of Ownership Interest Acquired + References No definition available. + Details
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- Definition Percentage Of Ownership Interests before acquisition + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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