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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