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Comprehensive Income - Summary of the tax effects allocated to each component of other comprehensive income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Comprehensive Income (Loss), Pre-Tax      
Foreign currency translation adjustment, Pre-Tax $ (19.6) $ 18.5 $ (10.2)
Change in net realized and unrealized gain (loss) on derivative securities, Pre-Tax 1.5 (1.1) (9.7)
Change in net unrealized gain (loss) on investment securities, Pre-Tax 19.5 21.6 (56.6)
Other comprehensive income (loss), Pre-Tax 1.4 39.0 (76.5)
Other Comprehensive Income (Loss), Tax Expenses      
Change in net realized and unrealized gain (loss) on derivative securities, Tax Benefit (Expense) (0.5) 0.4 3.8
Change in net unrealized gain (loss) on investment securities, Tax Benefit (Expense) (8.0) (8.1) 22.2
Other comprehensive income (loss), Tax Benefit (Expense) (8.5) (7.7) 26.0
Other Comprehensive Income (Loss), Net of Tax      
Foreign currency translation adjustment, Net of Tax (19.6) 18.5 (10.2)
Change in net realized and unrealized gain (loss) on derivative securities, net of tax 1.0 (0.7) (5.9)
Change in net unrealized gain (loss) on investment securities, Net of Tax 11.5 13.5 (34.4)
Other comprehensive income (loss), Net of Tax $ (7.1) $ 31.3 $ (50.5)