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Fair Value Measurements - Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Contingent Payment Arrangements        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 2.0 $ 9.8 $ 1.9 $ 9.4
Net realized and unrealized losses [1] 0.0 (0.8) 0.1 (0.4)
Purchases and issuances [2] 0.0 0.0 0.0 0.0
Settlements and reductions (2.0) (4.8) (2.0) (4.8)
Balance, end of period 0.0 4.2 0.0 4.2
Net change in unrealized losses relating to instruments still held at the reporting date 0.0 0.1 0.0 0.3
Affiliate Equity Repurchase Obligations        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 75.4 79.4 36.2 49.2
Net realized and unrealized losses [1] (0.1) 0.0 (0.1) 0.0
Purchases and issuances [2] 18.4 0.3 73.0 45.9
Settlements and reductions (36.3) (42.8) (51.7) (58.2)
Balance, end of period 57.4 36.9 57.4 36.9
Net change in unrealized losses relating to instruments still held at the reporting date $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1]
Accretion expense for these arrangements is recorded in Interest expense.
[2]
Includes transfers from Redeemable non-controlling interests.