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Organization, Principles Of Consolidation And Basis Of Presentation -Income Statement (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Net investment income	$ 153.3us-gaap_NetInvestmentIncome	$ 153.9us-gaap_NetInvestmentIncome
Income (loss) before income taxes	77.4	68.7
Income taxes	20.9us-gaap_IncomeTaxExpenseBenefit	20.6us-gaap_IncomeTaxExpenseBenefit
Net income	56.5us-gaap_NetIncomeLoss	48.1us-gaap_NetIncomeLoss	210.3us-gaap_NetIncomeLoss
Basic	$ 1.34us-gaap_EarningsPerShareBasic	$ 1.1us-gaap_EarningsPerShareBasic
Diluted	$ 1.32us-gaap_EarningsPerShareDiluted	$ 1.08us-gaap_EarningsPerShareDiluted
Previously Reported
Net investment income		150.6
Income (loss) before income taxes		65.4
Income taxes		15.3
Net income		$ 50.1
Basic		$ 1.14
Diluted		$ 1.13

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

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

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