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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Changes in level 3 assets and liabilities    
Transfers of financial assets $ 0  
Transfers of financial liabilities 0  
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 118.9 103.4
Net realized gains/losses (0.5) (0.8)
Net unrealized gains/losses relating to instruments still held at the reporting date 2.5 2.5
Purchases and issuances 4.9 4.8
Settlements and reductions (3.9) (2.4)
Balance at the end of period 121.9 107.5
Contingent payment arrangements
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period 31.0 87.1
Net unrealized gains/losses relating to instruments still held at the reporting date 9.5 (4.0)
Balance at the end of period 40.5 83.1
Obligations to related parties
    
Changes in level 3 assets and liabilities    
Balance at the beginning of the period 77.8 92.0
Net realized gains/losses 1.3 (0.3)
Net unrealized gains/losses relating to instruments still held at the reporting date (0.5) 1.0
Purchases and issuances 15.2 14.4
Settlements and reductions (3.1) (29.5)
Balance at the end of period $ 90.7 $ 77.6