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Fair Value Measurements - Changes in level 3 Inputs (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Investments [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period $ 131.8 $ 118.9
Net gains/losses 5.8 [1] 2.0 [1]
Purchases and issuances 3.7 4.9
Settlements and reductions (5.4) (3.9)
Net transfers in and/or out of Level 3 0 0
Balance, end of period 135.9 121.9
Net unrealized gains/losses relating to instruments still held at the reporting date 6.9 2.5
Contingent Payment Arrangements [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period 50.2 31.0
Net gains/losses 3.0 [2] 9.5 [2]
Purchases and issuances 0 0
Settlements and reductions 0 0
Net transfers in and/or out of Level 3 0 0
Balance, end of period 53.2 40.5
Net unrealized gains/losses relating to instruments still held at the reporting date 3.0 9.5
Obligations to Related Parties [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period 76.9 77.8
Net gains/losses 2.5 [3] 0.8 [3]
Purchases and issuances 59.4 15.2
Settlements and reductions (6.9) (3.1)
Net transfers in and/or out of Level 3 0 0
Balance, end of period 131.9 90.7
Net unrealized gains/losses relating to instruments still held at the reporting date $ 0.9 $ (0.5)
[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 expense 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 expense and contingent payment arrangements. Gains and losses related to liabilities offsetting certain investments are recorded in Investment and other income.