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Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other Comprehensive Income (Loss), Pre-Tax |  |  |
Foreign currency translation adjustment, Pre-Tax | $ 18.5 | $ (10.2) | $ 24.8
Change in net realized and unrealized gain (loss) on derivative securities, Pre-Tax | (1.1) | (9.7) | 5.9
Change in net unrealized gain (loss) on investment securities, Pre-Tax | 21.6 | (56.6) | 41.3
Other comprehensive income (loss), Pre-Tax | 39.0 | (76.5) | 72.0
Other Comprehensive Income (Loss), Tax Expenses |  |  |
Change in net realized and unrealized gain (loss) on derivative securities, Tax Benefit (Expense) | 0.4 | 3.8 | (2.2)
Change in net unrealized gain (loss) on investment securities, Tax Benefit (Expense) | (8.1) | 22.2 | (15.3)
Other comprehensive income (loss), Tax Benefit (Expense) | (7.7) | 26.0 | (17.5)
Other Comprehensive Income (Loss), Net of Tax |  |  |
Foreign currency translation adjustment, Net of Tax | 18.5 | (10.2) | 24.8
Change in net realized and unrealized gain (loss) on derivative securities, net of tax | (0.7) | (5.9) | 3.7
Change in net unrealized gain (loss) on investment securities, Net of Tax | 13.5 | (34.4) | 26.0
Other comprehensive income (loss), Net of Tax | $ 31.3 | $ (50.5) | $ 54.5

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