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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other Comprehensive Income (Loss), Pre-Tax    
Foreign currency translation adjustment, Pre-Tax $ (22.8) $ 14.4
Change in net realized and unrealized gain (loss) on derivative securities, Pre-Tax 0.3 (0.1)
Change in net unrealized gain on investment securities, Pre-Tax 1.0 14.3
Other comprehensive income (loss), Pre-Tax (21.5) 28.6
Other Comprehensive Income (Loss), Tax Benefit (Expense)    
Change in net realized and unrealized gain (loss) on derivative securities, Tax Benefit (Expense) (0.1) 0
Change in net unrealized gain on investment securities, Tax Benefit (Expense) 0.1 (5.2)
Other comprehensive income (loss), Tax Benefit (Expense) 0 (5.2)
Other Comprehensive Income (Loss), Net of Tax    
Foreign currency translation adjustment, Net of Tax (22.8) 14.4
Change in net realized and unrealized gain (loss) on derivative securities, net of tax 0.2 (0.1)
Change in net unrealized gain on investment securities, net of tax 1.1 9.1
Other comprehensive income (loss) $ (21.5) $ 23.4