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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 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 103.4 85.7
Net realized gains/losses (0.8) 1.1
Net unrealized gains/losses relating to instruments still held at the reporting date 2.5 5.6
Purchases and issuances 4.8 2.8
Settlements and reductions (2.4) (1.7)
Balance at the end of period 107.5 93.5
Contingent payment arrangements
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period 87.1 77.6
Net unrealized gains/losses relating to instruments still held at the reporting date (4.0) 5.4
Balance at the end of period 83.1 83.0
Obligations to related parties
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period 92.0 79.6
Net realized gains/losses (0.3) 0.3
Net unrealized gains/losses relating to instruments still held at the reporting date 1.0 2.5
Purchases and issuances 14.4 9.6
Settlements and reductions (29.5) (24.1)
Balance at the end of period $ 77.6 $ 67.9