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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
StatementOfIncomeAndComprehensiveIncomeAbstract      
Net income $ 219.3us-gaap_NetIncomeLoss $ 228.5us-gaap_NetIncomeLoss $ 138.5us-gaap_NetIncomeLoss
Unrealized gains on securities-available-for-sale:      
Net unrealized capital gains on securities-available-for-sale 50.3us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1] (205.3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1] 71.4us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1]
Reclassification adjustment for net capital (gains) losses included in net income, net CF (2.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax [2] (4.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax [2] (3.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax [2]
Employee benefit plans:      
Prior service (cost) credit and net (losses) gains arising during the period, net (70.4)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax [3] 41.2us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax [3] 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax [3]
Reclassification adjustment for amortization to net periodic pension cost, net 1.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] (6.0)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4] 6.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [4]
Total other comprehensive income, net of tax (20.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax (174.6)us-gaap_OtherComprehensiveIncomeLossNetOfTax 74.2us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income $ 198.9us-gaap_ComprehensiveIncomeNetOfTax $ 53.9us-gaap_ComprehensiveIncomeNetOfTax $ 212.7us-gaap_ComprehensiveIncomeNetOfTax
[1]

Net of tax expense of $24.6 million, tax benefit of $111.1 million and tax expense of $38.3 million for 2014, 2013 and 2012, respectively.
[2]

Net of tax benefits of $1.1 million, $3.1 million and $2.2 million for 2014, 2013 and 2012, respectively.
[3]

Net of tax benefit of $37.9 million and tax expenses of $22.2 million and $0.2 million for 2014, 2013 and 2012, respectively.
[4]

Net of tax expense of $0.9 million, tax benefit of $3.2 million and taxexpense of $3.4 million for 2014, 2013 and 2012, respectively.