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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Other investments
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period $ 103.4 $ 85.7
Net realized gains/losses (3.2) (0.2)
Net unrealized gains/losses relating to instruments still held at the reporting date 11.0 9.6
Purchases and issuances 18.8 17.7
Settlements and reductions (11.1) (9.4)
Balance at the end of period 118.9 103.4
Contingent payment arrangements
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period 87.1 77.6
Net realized gains/losses (0.6)  
Net unrealized gains/losses relating to instruments still held at the reporting date (40.2) 9.5
Purchases and issuances 24.8  
Settlements and reductions (40.1)  
Balance at the end of period 31.0 87.1
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 1.0 0.4
Net unrealized gains/losses relating to instruments still held at the reporting date 0.8 1.7
Purchases and issuances 32.1 52.8
Settlements and reductions (48.1) (42.5)
Balance at the end of period $ 77.8 $ 92.0