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Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Expense, Net    
Changes in level 3 assets and liabilities    
Losses resulting from changes in expected payments $ 0.6 $ 6.6
Interest Expense    
Changes in level 3 assets and liabilities    
Accretion expenses 0.7 1.0
Contingent Payment Arrangements    
Changes in level 3 assets and liabilities    
Balance, beginning of period 9.4 8.6
Net realized and unrealized (gains) losses [1] 1.3 7.6
Purchases and issuances [2] 0.0 0.0
Settlements and reductions (8.8) (6.8)
Balance, end of period 1.9 9.4
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] 0.2 2.8
Affiliate Equity Repurchase Obligations    
Changes in level 3 assets and liabilities    
Balance, beginning of period 49.2 12.1
Net realized and unrealized (gains) losses [1] 0.0 5.5
Purchases and issuances [2] 105.4 206.1
Settlements and reductions (118.4) (174.5)
Balance, end of period 36.2 49.2
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] $ 0.0 $ 0.0
[1] For the years ended December 31, 2017 and 2018, net realized and unrealized losses resulting from changes to contingent payment arrangements were $6.6 million and $0.6 million, respectively, and were recorded in Other expenses (net). For the years ended December 31, 2017 and 2018, the accretion expense for these arrangements was $1.0 million and $0.7 million, respectively, and was recorded in Interest expense.
[2] Includes transfers from Redeemable non-controlling interests.