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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income tax provision        
Current tax $ 11.6 $ 5.0 $ 40.2 $ 41.4
Deferred taxes 7.9 14.8 5.8 31.8
Provision for income taxes 19.4 19.8 46.0 73.2
Deferred tax benefit recognized from a reduction of corporate tax rates in the United Kingdom 7.2   7.2  
Controlling Interests:
        
Income tax provision        
Current tax 8.8 1.9 31.1 31.9
Intangible related deferred taxes 11.7 10.4 0.1 36.2
Other deferred taxes (1.2) 6.2 4.9 (1.6)
Provision for income taxes 19.3 18.5 36.1 66.5
Income before income taxes (controlling interest) 74.2 58.6 135.0 191.1
Effective tax rate attributable to controlling interests (as a percent) 26.00% 31.60% 26.70% 34.80%
Deferred tax benefit recognized from a reduction of corporate tax rates in the United Kingdom 4.8   4.8  
Non-controlling interests
        
Income tax provision        
Current tax 2.8 3.1 9.1 9.5
Deferred taxes (2.7) (1.8) 0.8 (2.8)
Provision for income taxes $ 0.1 $ 1.3 $ 9.9 $ 6.7