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Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 65.4 us-gaap_ProfitLoss | $ 4.7 us-gaap_ProfitLoss | $ 9.3 us-gaap_ProfitLoss | $ 35.1 us-gaap_ProfitLoss | $ 55.2 us-gaap_ProfitLoss | $ 70.1 us-gaap_ProfitLoss | $ 34.0 us-gaap_ProfitLoss | $ 58.4 us-gaap_ProfitLoss | $ 114.5 us-gaap_ProfitLoss | $ 217.7 us-gaap_ProfitLoss | $ 103.4 us-gaap_ProfitLoss
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 259.7 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (324.9)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 157.9 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | (25.1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (37.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | (61.2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (234.6)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax | 362.8 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax | (96.7)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (106.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | 61.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax | (29.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (98.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax | 86.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax | (13.2)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 0.2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax | 1.6 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | 0.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | 1.6 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 135.1 us-gaap_OtherComprehensiveIncomeLossBeforeTax | (276.0)us-gaap_OtherComprehensiveIncomeLossBeforeTax | 85.1 us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Parent |  |  |  |  |  |  |  |  | 91.6 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | (115.9)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | 55.9 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Securities Held by Parent |  |  |  |  |  |  |  |  | (8.8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (13.2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (21.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (82.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | 129.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax | (34.4)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 37.5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | (21.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax | 10.3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 34.7 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | (30.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 4.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax | (0.1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax | (0.6)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | (0.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | (0.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (47.7)us-gaap_OtherComprehensiveIncomeLossTax | 98.6 us-gaap_OtherComprehensiveIncomeLossTax | (30.4)us-gaap_OtherComprehensiveIncomeLossTax
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 87.4 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (177.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 54.7 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 114.5 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 217.7 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 103.4 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized Holding Gains (Losses) Arising During the Year: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 261.7 kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (324.9)kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 157.9 kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities Held by Parent |  |  |  |  |  |  |  |  | (2.0)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reclassification Adjustment for Amounts Included in Net Income: |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (26.8)kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (37.9)kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (61.2)kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeSubsidiariesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities Held by Parent |  |  |  |  |  |  |  |  | 1.7 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized Holding Gains (Losses) |  |  |  |  |  |  |  |  | (234.6)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 362.8 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (96.7)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | (106.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 61.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (29.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 7.9 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 25.0 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16.2 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (98.5)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 86.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13.2)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.6 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | (1.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.2 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.6 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Comprehensive Income (Loss) Before Income Taxes |  |  |  |  |  |  |  |  | 135.1 us-gaap_OtherComprehensiveIncomeLossBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (276.0)us-gaap_OtherComprehensiveIncomeLossBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 85.1 us-gaap_OtherComprehensiveIncomeLossBeforeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Benefit (Expense): |  |  |  |  |  |  |  |  |  |  |
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | (92.3)kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 115.9 kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (55.9)kmpr_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities Held by Parent |  |  |  |  |  |  |  |  | (0.7)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities Held by Subsidiaries |  |  |  |  |  |  |  |  | 9.4 kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13.2 kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21.5 kmpr_OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBySubsidiariesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Securities Held by Parent |  |  |  |  |  |  |  |  | 0.6 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrealized Holding Gains and Losses |  |  |  |  |  |  |  |  | (82.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 129.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (34.4)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Unrecognized Postretirement Benefit Costs Arising During the Year |  |  |  |  |  |  |  |  | 37.5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (21.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10.3 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | (2.8)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8.8)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5.7)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Unrecognized Postretirement Benefit Costs |  |  |  |  |  |  |  |  | 34.7 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (30.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4.6 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.6)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Reclassification Adjustment for Amounts Included in Net Income |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  | 0.4 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.1)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (0.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Comprehensive Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (47.7)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 98.6 us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (30.4)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  | 87.4 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (177.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54.7 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Comprehensive Income |  |  |  |  |  |  |  |  | $ 201.9 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 40.3 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 158.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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