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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance $ 134.7us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 309.3us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (20.1)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1] (164.1)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [2]  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (0.3)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [3] (10.5)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax [4]  
Total other comprehensive income, net of tax (20.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax (174.6)us-gaap_OtherComprehensiveIncomeLossNetOfTax 74.2us-gaap_OtherComprehensiveIncomeLossNetOfTax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance 114.3us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 134.7us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 309.3us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Unrealized Gains (losses) on Available For Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance 173.2us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 383.0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 50.3us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [1] (205.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [2]  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (2.0)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [3] (4.5)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 [4]  
Total other comprehensive income, net of tax 48.3us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (209.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance 221.5us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 173.2us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Employee Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (38.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 (73.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (70.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [1] 41.2us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.7us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [3] (6.0)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [4]  
Total other comprehensive income, net of tax (68.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 35.2us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (107.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 $ (38.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		  
[1]
Net of tax expense of $24.6 million for net unrealized gains on fixed maturity securities and net of tax benefit of $37.9 million for employee benefits.
[2]
Net of tax benefit of $111.1 million for net unrealized losses on fixed maturity securities and net of tax expense of $22.2 million for employee benefits.
[3]
Net of tax benefit of $1.1 million for net unrealized gains on fixed maturity securities and net of tax expense of $0.9 million for employee benefits.
[4]
Net of tax benefits of $3.1 million for net unrealized gains on fixed maturity securities and $3.2 million for employee benefits, respectively.