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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income tax provision    
Deferred taxes $ 15.1 $ 12.7
Provision for income taxes 48.9 37.5
Controlling Interests [Member]
    
Income tax provision    
Current tax 30.3 21.2
Intangible-related deferred taxes 16.9 12.0
Other deferred taxes (1.6) 0.9
Provision for income taxes 45.6 34.1
Income before income taxes (controlling interest) 122.8 96.5
Effective tax rate attributable to controlling interests (as a percent) 37.10% [1] 35.30% [1]
Non-controlling interests [Member]
    
Income tax provision    
Current tax 3.5 3.6
Deferred taxes (0.2) (0.2)
Provision for income taxes $ 3.3 $ 3.4
[1] Taxes attributable to the controlling interest divided by Income before income taxes (controlling interest).