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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income tax provision        
Current tax $ 17.5 $ 19.2 $ 28.6 $ 36.4
Deferred taxes (15.5) 7.4 (2.0) 17.0
Provision for income taxes 2.0 26.6 26.6 53.4
Controlling Interests:
        
Income tax provision        
Current tax 14.3 16.4 22.3 30.0
Intangible related deferred taxes (21.5) 12.9 (11.6) 25.8
Other deferred taxes 3.3 (5.0) 6.2 (7.8)
Provision for income taxes (3.9) 24.3 16.9 48.0
Income before income taxes (controlling interest) 2.7 69.8 60.9 132.5
Effective tax rate attributable to controlling interests (as a percent) (144.40%) 34.80% 27.80% 36.20%
Non-controlling interests
        
Income tax provision        
Current tax 3.2 2.8 6.3 6.4
Deferred taxes 2.7 (0.5) 3.4 (1.0)
Provision for income taxes $ 5.9 $ 2.3 $ 9.7 $ 5.4