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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income tax provision    
Deferred taxes $ 12.7 $ 13.4
Provision for income taxes 37.5 24.6
Controlling Interests:
    
Income tax provision    
Current tax 21.2 8.0
Intangible related deferred taxes 12.0 9.9
Other deferred taxes 0.9 2.9
Provision for income taxes 34.1 20.8
Income before income taxes (controlling interest) 96.5 58.2
Effective tax rate attributable to controlling interests (as a percent) 35.30% 35.70%
Non-controlling interests
    
Income tax provision    
Current tax 3.6 3.2
Deferred taxes (0.2) 0.6
Provision for income taxes $ 3.4 $ 3.8