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Comprehensive Income (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Comprehensive Income      
Foreign currency translation adjustments $ 76.2 $ 57.7  
Realized and unrealized losses on derivative securities (2.9) (2.2)  
Unrealized gain (loss) on investment securities 8.0 (5.5)  
Accumulated other comprehensive income 81.3 50.0  
Accumulated other comprehensive income (non-controlling interests) (2.2)    
Accumulated other comprehensive income (controlling interest) 79.1 50.0  
Foreign currency translation adjustment 18.5 (10.2) 24.8
Change in net realized and unrealized gains (losses) 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) 31.3 (50.5) 54.5
Other comprehensive income (non-controlling interests) (2.2)    
Other comprehensive income (controlling interest) $ 29.1