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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other Comprehensive Income (Loss), Pre-Tax    
Foreign currency translation adjustment, Pre-Tax $ 14.4 $ 14.2
Change in net realized and unrealized gain (loss) on derivative securities, Pre-Tax (0.1) 1.1
Change in net unrealized gain (loss) on investment securities, Pre-Tax 14.3 (5.7)
Other comprehensive income, Pre-Tax 28.6 9.6
Other Comprehensive Income (Loss), Tax Expenses    
Change in net realized and unrealized gain (loss) on derivative securities, Tax Benefit (Expense) 0 (0.4)
Change in net unrealized gain (loss) on investment securities, Tax Benefit (Expense) (5.2) 2.2
Other comprehensive income, Tax Benefit (Expense) (5.2) 1.8
Other Comprehensive Income (Loss), Net of Tax    
Foreign currency translation adjustment, Net of Tax 14.4 14.2
Change in net realized and unrealized gain (loss) on derivative securities, Net of Tax (0.1) 0.7
Change in net unrealized gain (loss) on investment securities, Net of Tax 9.1 (3.5)
Other comprehensive income (loss), Net of Tax $ 23.4 $ 11.4