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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Changes in level 3 assets and liabilities        
Transfers of financial assets from level 1 to level 2 $ 2.0   $ 2.0  
Other investments
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 113.0 102.0 103.4 85.8
Net realized gains/losses (0.1) (0.3) (1.7) 0.7
Net unrealized gains/losses relating to instruments still held at the reporting date 1.6 3.5 7.7 14.0
Purchases and issuances 3.5 4.2 13.4 12.8
Settlements and reductions (1.3) (2.1) (6.1) (6.0)
Balance at the end of period 116.7 107.3 116.7 107.3
Contingent payment arrangements
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 62.5 85.3 87.1 77.6
Net unrealized gains/losses relating to instruments still held at the reporting date 3.5 2.0 (45.9) 11.4
Purchases and issuances     24.8  
Settlements and reductions       (1.7)
Balance at the end of period 66.0 87.3 66.0 87.3
Obligations to related parties
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 79.5 71.2 92.0 79.6
Net realized gains/losses 0.5 0.8 0.9 1.4
Net unrealized gains/losses relating to instruments still held at the reporting date 0.2 (0.4) 0.9 3.2
Purchases and issuances 1.7 8.5 22.1 21.5
Settlements and reductions (6.1) (8.5) (40.1) (34.1)
Balance at the end of period $ 75.8 $ 71.6 $ 75.8 $ 71.6