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Affiliate Equity (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
Affiliate Equity        
Compensation expenses related to Affiliate equity $ 9.1 $ 8.8 $ 17.5 $ 15.1
Compensation expenses related to Affiliate equity, attributable to controlling interest 3.2 4.8 8.4 7.0
Changes in redeemable non-controlling interests during the period        
Balance at the beginning of the period     477.5  
Issuance of Redeemable non-controlling interests     3.4  
Repurchase of Redeemable non-controlling interests     (28.7)  
Changes in redemption value     67.6  
Balance at the end of the period 519.8   519.8  
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity        
Net income (controlling interest) 64.7 6.6 127.1 44.0
Decrease in controlling interest paid-in capital from purchases and sales of Affiliate equity (19.3) (2.6) (24.1) (8.6)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 45.4 $ 4.0 $ 103.0 $ 35.4