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Comprehensive Income (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Foreign currency translation adjustments $ 72.1   $ 57.7
Realized and unrealized losses on derivative securities (2.3)   (2.2)
Unrealized gain (loss) on investment securities 3.6   (5.5)
Accumulated other comprehensive income 73.4   50.0
Accumulated other comprehensive income (non-controlling interests) (1.7)    
Accumulated other comprehensive income (controlling interest) 71.7   50.0
Foreign currency translation adjustment 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 23.4 11.4  
Other comprehensive income (non-controlling interests) (1.7)    
Other comprehensive income (controlling interest) $ 21.7