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Fair Value Measurements - Changes in level 3 Inputs (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other investments [Member]
        
Changes in level 3 assets and liabilities        
Balance, beginning of period $ 124.4 $ 113.0 $ 118.9 $ 103.4
Net realized gains/losses (0.5) [1] (0.1) [1] (1.9) [1] (1.7) [1]
Net unrealized gains/losses relating to instruments still held at the reporting date 4.7 [1] 1.6 [1] 11.1 [1] 7.7 [1]
Purchases and issuances 2.2 3.5 9.9 13.4
Settlements and reductions (4.5) (1.3) (11.7) (6.1)
Net transfers in and/or out of Level 3 0 0 0 0
Balance, end of period 126.3 116.7 126.3 116.7
Contingent payment arrangements [Member]
        
Changes in level 3 assets and liabilities        
Balance, beginning of period 44.3 62.5 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 1.8 [2] 3.5 [2] 15.1 [2] (45.9) [2]
Purchases and issuances 0 0 0 24.8
Settlements and reductions 0 0 0 0
Net transfers in and/or out of Level 3 0 0 0 0
Balance, end of period 46.1 66.0 46.1 66.0
Obligations to related parties [Member]
        
Changes in level 3 assets and liabilities        
Balance, beginning of period 96.6 79.5 77.8 92.0
Net realized gains/losses 1.1 [3] 0.5 [3] 3.1 [3] 0.9 [3]
Net unrealized gains/losses relating to instruments still held at the reporting date (0.1) [3] 0.2 [3] 0.1 [3] 0.9 [3]
Purchases and issuances 23.1 1.7 55.1 22.1
Settlements and reductions (22.0) (6.1) (37.4) (40.1)
Net transfers in and/or out of Level 3 0 0 0 0
Balance, end of period $ 98.7 $ 75.8 $ 98.7 $ 75.8
[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.