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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income tax provision        
Deferred taxes $ 16.1 $ (15.5) $ 28.8 $ (2.0)
Provision for income taxes 38.2 2.0 75.7 26.6
Controlling Interests [Member]
        
Income tax provision        
Current tax 19.8 14.3 41.0 22.3
Intangible-related deferred taxes 12.3 (21.5) 24.3 (11.6)
Other deferred taxes 4.0 3.3 4.8 6.2
Provision for income taxes 36.1 (3.9) 70.1 16.9
Income before income taxes (controlling interest) 100.8 2.7 197.2 60.9
Effective tax rate attributable to controlling interests (as a percent) 35.80% [1] (144.40%) [1] 35.50% [1] 27.80% [1]
Non-controlling interests [Member]
        
Income tax provision        
Current tax 2.3 3.2 5.9 6.3
Deferred taxes (0.2) 2.7 (0.3) 3.4
Provision for income taxes $ 2.1 $ 5.9 $ 5.6 $ 9.7
[1] Taxes attributable to the controlling interest divided by Income before income taxes (controlling interest).