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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income tax provision    
Current tax $ 11.2 $ 17.1
Deferred taxes 13.4 9.6
Provision for income taxes 24.6 26.7
Controlling Interests:
    
Income tax provision    
Current tax 8.0 13.5
Intangible related deferred taxes 9.9 12.9
Other deferred taxes 2.9 (2.8)
Provision for income taxes 20.8 23.6
Income before income taxes (controlling interest) 58.2 62.7
Effective tax rate attributable to controlling interests (as a percent) 35.70% 37.60%
Non-controlling interests
    
Income tax provision    
Current tax 3.2 3.6
Deferred taxes 0.6 (0.5)
Provision for income taxes $ 3.8 $ 3.1