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Other Comprehensive Income and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Other Comprehensive Income Before Income Taxes: |  |  |  |
Unrealized Holding Gain (Loss) Arising During the Period, before Reclassification Adjustment and Tax | $ (233.8) | $ 76.7 | $ (257.7) | $ 81.9
Reclassification Adjustment for Amounts Included in Net Income | (1.2) | (4.1) | (25.3) | (8.0)
Unrealized Holding Gains (Losses) | (235.0) | 72.6 | (283.0) | 73.9
Foreign Currency Translation Adjustments | 0.1 | 0.6 | (0.1) | 1.3
Amortization of Unrecognized Postretirement Benefit Costs | 6.7 | 3.2 | 12.1 | 7.6
Other Comprehensive Income (Loss) Before Income Taxes | (228.2) | 76.4 | (271.0) | 82.8
Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | 82.6 | (27.2) | 92.2 | (29.0)
Reclassification Adjustment for Amounts Included in Net Income | 0.4 | 1.4 | 8.8 | 2.8
Unrealized Holding (Gains) Losses | 83.0 | (25.8) | 101.0 | (26.2)
Foreign Currency Translation Adjustment | (0.1) | (0.1) | 0 | (0.4)
Amortization of Unrecognized Postretirement Benefit Costs | (2.3) | (1.1) | (4.2) | (2.7)
Other Comprehensive Income Tax Benefit (Expense) | $ (80.6) | $ 27.0 | $ (96.8) | $ 29.3

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