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Affiliate Equity (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Affiliate Equity                      
Compensation expenses related to Affiliate equity                 $ 38.0 $ 29.0 $ 26.2
Compensation expenses related to Affiliate equity, attributable to controlling interest                 21.6 22.1 14.5
Changes in redeemable non-controlling interests during the period                      
Balance at the beginning of the period       451.8       406.3 451.8 406.3  
Issuance of Redeemable non-controlling interest                 11.2 52.5  
Repurchase of Redeemable non-controlling interest                 (28.4) (57.8)  
Changes in redemption value                 42.9 50.8  
Balance at the end of the period 477.5       451.8       477.5 451.8 406.3
Effect of changes in the Company's ownership interest in its Affiliates on the controlling interest's equity                      
Net income (controlling interest) 75.0 54.9 6.6 37.5 40.3 40.1 45.4 39.1 174.0 164.9 138.6
Increase (decrease) in controlling interest paid-in capital from the sale of Affiliate equity                 (44.0) (28.1) (45.4)
Change from Net income (controlling interest) and net transfers with non-controlling interests                 $ 130.0 $ 136.8 $ 93.2