v2.4.0.6

Other Comprehensive Income and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Other Comprehensive Income Before Income Taxes: |  |  |  |
Unrealized Holding Gain (Loss) Arising During the Period, before Reclassification Adjustment and Tax | $ 98.3 | $ 138.0 | $ 180.2 | $ 192.0
Reclassification Adjustment for Amounts Included in Net Income | (50.6) | 3.5 | (58.6) | (27.2)
Unrealized Holding Gains (Losses) | 47.7 | 141.5 | 121.6 | 164.8
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.2 | 0 | 1.5 | 0.6
Reclassification Adjustment for Amounts Included in Net Income | 0 | 0 | 0 | 0
Foreign Currency Translation Adjustments | 0.2 | 0 | 1.5 | 0.6
Amortization of Unrecognized Postretirement Benefit Costs | 4.4 | 2.1 | 12.0 | 6.5
Other Comprehensive Income Before Income Taxes | 52.3 | 143.6 | 135.1 | 171.9
Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | (34.8) | (49.2) | (63.8) | (68.4)
Reclassification Adjustment for Amounts Included in Net Income | 17.8 | (1.2) | 20.6 | 9.6
Unrealized Holding (Gains) Losses | (17.0) | (50.4) | (43.2) | (58.8)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | (0.1) | 0 | (0.5) | (0.2)
Reclassification Adjustment for Amounts Included in Net Income | 0 | 0 | 0 | 0
Foreign Currency Translation Adjustment | (0.1) | 0 | (0.5) | (0.2)
Amortization of Unrecognized Postretirement Benefit Costs | (1.6) | (0.6) | (4.3) | (2.2)
Other Comprehensive Income Tax Expense | $ 18.7 | $ 51.0 | $ 48.0 | $ 61.2

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