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Fair Value Measurements - Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Contingent Payment Arrangements    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 9.4 $ 8.6
Net realized and unrealized losses [1] 0.4 0.3
Purchases and issuances [2] 0.0 0.0
Settlements and reductions 0.0 0.0
Balance, end of period 9.8 8.9
Net change in unrealized losses relating to instruments still held at the reporting date 0.4 0.3
Affiliate Equity Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 49.2 12.1
Net realized and unrealized losses [1] 0.0 0.0
Purchases and issuances [2] 45.6 99.6
Settlements and reductions (15.4) (20.2)
Balance, end of period 79.4 91.5
Net change in unrealized 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 and Affiliate equity obligations are recorded in Other expenses (net).
[2] Includes transfers from Redeemable non-controlling interests.