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Fair Value Measurements - Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Contingent Payment Arrangements    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 1.9 $ 9.4
Net realized and unrealized losses [1] 0.1 0.4
Purchases and issuances [2] 0.0 0.0
Settlements and reductions 0.0 0.0
Balance, end of period 2.0 9.8
Net change in unrealized losses relating to instruments still held at the reporting date 0.3 0.4
Affiliate Equity Repurchase Obligations    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 36.2 49.2
Net realized and unrealized losses [1] 0.0 0.0
Purchases and issuances [2] 54.6 45.6
Settlements and reductions (15.4) (15.4)
Balance, end of period 75.4 79.4
Net change in unrealized losses relating to instruments still held at the reporting date $ 0.0 $ 0.0
[1] Accretion expense for these arrangements is recorded in Interest expense.
[2] Includes transfers from Redeemable non-controlling interests.