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Affiliate Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Affiliate Equity      
Affiliate equity compensation $ 14.8 $ 11.5  
Tax benefit 2.9 3.2  
Compensation expenses related to affiliate equity noncontrolling interests 7.2 3.2  
Affiliate equity compensation cost not yet recognized 78.0   68.2
Affiliate equity compensation cost not yet recognized attributable to noncontrolling interest 42.0   32.1
Period for recognition 4 years    
Changes in redeemable non-controlling interests during the period      
Balance at the beginning of the period 641.9    
Transactions in Redeemable non-controlling interests (29.8)    
Changes in redemption value 48.5    
Balance at the end of the period 660.6    
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity      
Net income (controlling interest) 77.2 62.4  
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity (16.3) (4.8)  
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 60.9 $ 57.6