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Fair Value Measurements - Schedule of Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Contingent Payment Arrangements    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 10.2 $ 59.3
Net (gains) losses [1] (2.4) (27.8)
Purchases and issuances 0.0 0.0
Settlements and reductions 0.0 0.0
Balance, end of period 7.8 31.5
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] (2.4) (27.8)
Affiliate Equity Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 62.3 21.5
Net (gains) losses 0.0 0.0
Purchases and issuances 30.1 15.4
Settlements and reductions (56.8) (20.1)
Balance, end of period 35.6 16.8
Net change in unrealized (gains) losses relating to instruments still held at the reporting date $ 0.0 $ 0.0
[1] Accretion and changes to the Company’s contingent payment arrangements are recorded in Imputed interest expense and contingent payment arrangements.