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Fair Value Measurements - Changes in Level 3 Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Contingent Payment Arrangements        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 4.2 $ 7.8 $ 9.4 $ 8.6
Net realized and unrealized (gains) losses [1] 0.1 0.3 (0.3) 2.3
Purchases and issuances [2] 0.0 0.0 0.0 0.0
Settlements and reductions 0.0 0.0 (4.8) (2.8)
Balance, end of period 4.3 8.1 4.3 8.1
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] 0.1 0.3 0.4 2.3
Affiliate Equity Repurchase Obligations        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 36.9 70.7 49.2 12.1
Net realized and unrealized (gains) losses [1] 0.0 (0.2) 0.0 (0.2)
Purchases and issuances [2] 40.1 11.1 86.0 161.5
Settlements and reductions (48.3) (35.9) (106.5) (127.7)
Balance, end of period 28.7 45.7 28.7 45.7
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1] Accretion and changes in the expected value of the Company’s contingent payment arrangements and Affiliate equity repurchase obligations are recorded in Other expenses (net) in the Consolidated Statements of Income.
[2] Includes transfers from Redeemable non-controlling interests.