Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 62.0us-gaap_NetIncomeLoss	$ 45.7us-gaap_NetIncomeLoss
Other comprehensive income (loss), before tax:
Unrealized gains/losses on securities	206.5	315.9
Other-than-temporary impairments	1.2	6.6
Pension and other post-employment benefit liability	(0.6)	(0.6)
Other comprehensive income (loss), before tax	207.1	321.9
Income tax expense (benefit) related to items of other comprehensive income (loss)	71.8	112.4
Other comprehensive income (loss), after tax	135.3	209.5
Comprehensive income (loss)	$ 197.3us-gaap_ComprehensiveIncomeNetOfTax	$ 255.2us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.

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Other Comprehensive Income (Loss), Available-for-sale Securities and Derivatives Adjustment, before Tax, Portion Attributable to Parent, Total

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