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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income tax provision      
Current tax $ 72.7 $ 57.9 $ 56.1
Deferred taxes 11.1 35.2 35.4
Provision for income taxes 83.8 93.1 91.5
Controlling Interests:
     
Income tax provision      
Current tax 61.0 45.0 42.1
Intangible related deferred taxes 22.7 43.2 47.5
Other deferred taxes (12.1) (4.0) (9.3)
Provision for income taxes 71.6 84.2 80.3
Income before income taxes (controlling interest) 245.6 249.1 218.9
Effective tax rate attributable to controlling interests (as a percent) 29.20% 33.80% 36.70%
Non-controlling interests
     
Income tax provision      
Current tax 11.7 12.9 14.0
Deferred taxes 0.5 (4.0) (2.8)
Provision for income taxes $ 12.2 $ 8.9 $ 11.2