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Summary of Significant Accounting Policies (Recently Adopted in Accounting Principles) (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2010 Cumulative-Effect Adjustment, Deconsolidation of Variable Interest Entity Variable Interest Entity, Not Primary Beneficiary | Dec. 31, 2012 Accounting Standards Update 2010-26
Variable Interest Entity [Line Items] |  |  |  |
Change in accounting principle from new accounting pronouncement |  |  | $ 0.4 |
Deferred acquisition costs | 195.3 | 187.0 |  |
Deferred policy acquisition costs, amortization expense |  |  |  | $ 5.6

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