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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
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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)

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