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New Accounting Standards (Narrative) (Details) (Accounting Standards Update 2010-26 [Member], Restatement Adjustment [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Accounting Standards Update 2010-26 [Member] \| Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect decrease to total stockholders' equity	$ (318.4)
Cumulative effect decrease to deferred policy acquisition costs balance	$ (470.1)

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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