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Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Other Comprehensive Income (Loss), Pre-Tax        
Foreign currency translation adjustment, Pre-Tax $ 15.2 $ (34.6) $ 19.7 $ (18.2)
Change in net realized and unrealized loss on derivative securities, Pre-Tax (0.5) (10.2) (1.4) (11.5)
Change in net unrealized loss on investment securities, Pre-Tax 1.9 (64.8) (1.8) (74.3)
Other comprehensive income (loss), Pre-Tax 16.6 (109.6) 16.5 (104.0)
Other Comprehensive Income (Loss), Tax Expenses        
Change in net realized and unrealized loss on derivative securities, Tax Benefit (Expense) 0.2 3.9 0.5 4.4
Change in net unrealized loss on investment securities, Tax Benefit (Expense) (0.7) 24.3 0.7 28.1
Other comprehensive income (loss), Tax Benefit (Expense) (0.5) 28.2 1.2 32.5
Other Comprehensive Income (Loss), Net of Tax        
Foreign currency translation adjustment, Net of Tax 15.2 (34.6) 19.7 (18.2)
Change in net realized and unrealized loss on derivative securities, Net of Tax (0.3) (6.3) (0.9) (7.1)
Change in net unrealized loss on investment securities, Net of Tax 1.2 (40.5) (1.1) (46.2)
Other comprehensive income (loss), Net of Tax $ 16.1 $ (81.4) $ 17.7 $ (71.5)