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Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contingent Payment Arrangements    
Changes in level 3 assets and liabilities    
Balance, beginning of period $ 1.9 $ 9.4
Net realized and unrealized (gains) losses [1] 0.1 1.3
Purchases and issuances [2] 0.0 0.0
Settlements and reductions (2.0) (8.8)
Balance, end of period 0.0 1.9
Net change in unrealized (gains) losses relating to instruments still held at the reporting date 0.0 0.2
Affiliate Equity Repurchase Obligations    
Changes in level 3 assets and liabilities    
Balance, beginning of period 36.2 49.2
Net realized and unrealized (gains) losses [1] 0.1 0.0
Purchases and issuances [2] 118.6 105.4
Settlements and reductions (135.1) (118.4)
Balance, end of period 19.8 36.2
Net change in unrealized (gains) 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.