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Fair Value Measurements - Schedule of changes in Level 3 financial assets and liabilities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Other Investments [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period $ 118.9 $ 103.4
Net gains/losses 12.3 [1] 7.8 [1]
Purchases and issuances 18.0 18.8
Settlements and reductions (17.4) (11.1)
Net transfers in and/or out of Level 3 0 0
Balance, end of period 131.8 118.9
Net unrealized gains/losses relating to instruments still held at the reporting date 16.5 11.0
Contingent Payment Arrangements [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period 31.0 87.1
Net gains/losses 19.2 [2] (40.8) [2]
Purchases and issuances 0 24.8
Settlements and reductions 0 (40.1)
Net transfers in and/or out of Level 3 0 0
Balance, end of period 50.2 31.0
Net unrealized gains/losses relating to instruments still held at the reporting date 19.2 (13.5)
Obligations to related parties [Member]
    
Changes in level 3 assets and liabilities    
Balance, beginning of period 77.8 92.0
Net gains/losses 6.2 [3] 1.8 [3]
Purchases and issuances 62.9 32.1
Settlements and reductions (70.0) (48.1)
Net transfers in and/or out of Level 3 0 0
Balance, end of period 76.9 77.8
Net unrealized gains/losses relating to instruments still held at the reporting date $ 2.2 $ 0.8
[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 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.