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Affiliate Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Affiliate Equity        
Compensation expenses related to Affiliate equity $ 4.7 $ 6.5 $ 22.2 $ 21.6
Compensation expenses related to Affiliate equity, attributable to controlling interest 2.5 2.3 10.9 9.4
Changes in redeemable non-controlling interests during the period        
Balance at the beginning of the period     477.5  
Transactions in Redeemable non-controlling interests     (40.0)  
Changes in redemption value     176.6  
Balance at the end of the period 614.1   614.1  
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity        
Net income (controlling interest) 75.2 54.9 202.3 98.9
Increase (decrease) in controlling interest paid-in capital from purchases and sales of Affiliate equity 0.9 1.1 (23.1) (7.5)
Change from Net income (controlling interest) and net transfers with non-controlling interests $ 76.1 $ 56.0 $ 179.2 $ 91.4