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Affiliate Equity (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
Affiliate Equity        
Compensation expenses related to Affiliate equity $ 6.5 $ 6.4 $ 21.6 $ 17.6
Compensation expenses related to Affiliate equity, attributable to controlling interest 2.3 1.9 9.3 9.1
Changes in redeemable non-controlling interests during the period        
Balance at the beginning of the period     451.8  
Issuance of Redeemable non-controlling interest     9.3  
Repurchase of Redeemable non-controlling interest     (15.8)  
Changes in redemption value     67.8  
Balance at the end of the period 513.1   513.1  
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity        
Net income (controlling interest) 54.9 40.1 98.9 124.6
Increase (decrease) in controlling interest paid-in capital from purchase and sales of Affiliate equity 1.1 (4.9) (7.5) (4.5)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 56.0 $ 35.2 $ 91.4 $ 120.1