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Fair Value Measurements - Schedule of Changes in Level 3 Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Contingent Payment Arrangements    
Changes in level 3 assets and liabilities    
Balance, beginning of period $ 10.2 $ 59.3
Net (gains) losses [1] (1.6) (40.9)
Purchases and issuances 0.0 9.3
Settlements and reductions 0.0 (17.5)
Balance, end of period 8.6 10.2
Net change in unrealized (gains) losses relating to instruments still held at the reporting date (1.6) (40.9)
Obligations to Related Parties    
Changes in level 3 assets and liabilities    
Balance, beginning of period 62.3 21.5
Net (gains) losses 3.1 (1.4)
Purchases and issuances 69.1 158.0
Settlements and reductions (122.4) (115.8)
Balance, end of period 12.1 62.3
Net change in unrealized (gains) losses relating to instruments still held at the reporting date $ 0.0 $ 0.0
[1] Accretion and changes in the expected value of the Company’s contingent payment arrangements are recorded in Imputed interest expense and contingent payment arrangements.