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Other Comprehensive Income and Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings | $ (0.1) | $ 1.4
Other Unrealized Gains on Investments | 227.6 | 408.1
Foreign Currency Translation Adjustments, Net of Income Taxes | 0.6 | 0.7
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes | (89.6) | (97.5)
Accumulated Other Comprehensive Income | $ 138.5 | $ 312.7

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