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Fair Value Measurements (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Changes in level 3 assets and liabilities        
Transfers of financial assets from level 1 to level 2   $ 2.0   $ 2.0
Other investments [Member]
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 121.9 107.5 118.9 103.4
Net realized gains/losses (0.9) [1] (0.9) [1] (1.4) [1] (1.7) [1]
Net unrealized gains/losses relating to instruments still held at the reporting date 3.9 [1] 3.6 [1] 6.4 [1] 6.1 [1]
Purchases and issuances 2.8 5.2 7.7 10.0
Settlements and reductions (3.3) (2.4) (7.2) (4.8)
Net transfers in and/or out of Level 3 0 0 0 0
Balance at the end of period 124.4 113.0 124.4 113.0
Contingent payment arrangements [Member]
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 40.5 83.1 31.0 87.1
Net realized gains/losses 0 0 0 0
Net unrealized gains/losses relating to instruments still held at the reporting date 3.8 [2] (45.4) [2] 13.3 [2] (49.4) [2]
Purchases and issuances 0 24.8 0 24.8
Settlements and reductions 0 0 0 0
Net transfers in and/or out of Level 3 0 0 0 0
Balance at the end of period 44.3 62.5 44.3 62.5
Obligations to related parties [Member]
        
Changes in level 3 assets and liabilities        
Balance at the beginning of the period 90.7 77.6 77.8 92.0
Net realized gains/losses 0.6 [3] 0.7 [3] 2.0 [3] 0.5 [3]
Net unrealized gains/losses relating to instruments still held at the reporting date 0.6 [3] (0.2) [3] 0.2 [3] 0.8 [3]
Purchases and issuances 16.9 6.0 32.0 20.3
Settlements and reductions (12.2) (4.6) (15.4) (34.1)
Net transfers in and/or out of Level 3 0 0 0 0
Balance at the end of period $ 96.6 $ 79.5 $ 96.6 $ 79.5
[1] Gains and losses on Other investments are recorded in Investment and other income.
[2] Accretion and changes to payment estimates under the Company's contingent payment arrangements are recorded in Imputed interest and contingent payment arrangements and foreign currency translation adjustments related to such arrangements are recorded as Other comprehensive income.
[3] Gains and losses associated with agreements to repurchase Affiliate equity are recorded in Imputed interest and contingent payment arrangements. Gains and losses related to liabilities offsetting certain investments are recorded in Investment and other income.