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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Changes in level 3 assets and liabilities        
Transfers of financial assets from level 1 to level 2     $ 2.0  
Other investments
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 107.5 93.6 103.4 85.8
Net realized gains/losses (0.9) (0.1) (1.7) 1.0
Net unrealized gains/losses relating to instruments still held at the reporting date 3.6 4.9 6.1 10.5
Purchases and issuances 5.2 5.8 10.0 8.6
Settlements and reductions (2.4) (2.2) (4.8) (3.9)
Balance at the end of period 113.0 102.0 113.0 102.0
Contingent payment arrangements
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 83.1 83.0 87.1 77.6
Net unrealized gains/losses relating to instruments still held at the reporting date (45.4) 4.0 (49.4) 9.4
Purchases and issuances 24.8   24.8  
Settlements and reductions   (1.7)   (1.7)
Balance at the end of period 62.5 85.3 62.5 85.3
Obligations to related parties
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 77.6 67.9 92.0 79.6
Net realized gains/losses 0.7 0.3 0.5 0.6
Net unrealized gains/losses relating to instruments still held at the reporting date (0.2) 1.1 0.8 3.6
Purchases and issuances 6.0 3.4 20.3 13.0
Settlements and reductions (4.6) (1.5) (34.1) (25.6)
Balance at the end of period $ 79.5 $ 71.2 $ 79.5 $ 71.2