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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ (152.1) | $ 96.9 | $ (102.4) | $ 221.3
Reclassification Adjustment for Amounts Included in Net Income | (31.9) | 0.7 | (28.3) | (3.7)
Unrealized Holding Gains (Losses) | (184.0) | 97.6 | (130.7) | 217.6
Foreign Currency Translation Adjustments | 0.1 | (0.2) | (0.8) | (0.2)
Amortization of Net Unrecognized Postretirement Benefit Costs | (6.1) | (1.9) | (11.5) | (3.9)
Other Comprehensive Income (Loss) Before Income Taxes | (177.8) | 99.3 | (120.0) | 221.3
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | 53.8 | (34.1) | 36.3 | (78.0)
Reclassification Adjustment for Amounts Included in Net Income | 11.2 | (0.2) | 9.9 | 1.3
Unrealized Holding Gains and Losses | 65.0 | (34.3) | 46.2 | (76.7)
Foreign Currency Translation Adjustments | 0.0 | 0.1 | 0.3 | 0.1
Amortization of Net Unrecognized Postretirement Benefit Costs | (2.2) | (0.7) | (3.9) | (1.4)
Other Comprehensive Income Tax Benefit (Expense) | $ (62.8) | $ 34.9 | $ (42.6) | $ 78.0

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