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Affiliate Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Affiliate Equity    
Compensation expenses related to Affiliate equity $ 8.3 $ 6.3
Compensation expenses related to Affiliate equity, attributable to controlling interest 5.2 2.2
Changes in redeemable non-controlling interests during the period    
Balance at the beginning of the period 477.5  
Issuance of Redeemable non-controlling interest 3.4  
Repurchase of Redeemable non-controlling interest (12.9)  
Changes in redemption value 44.0  
Balance at the end of the period 512.0  
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity    
Net income (controlling interest) 62.4 37.4
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity (4.8) (6.0)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 57.6 $ 31.4