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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Contingent Payment Arrangements        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 9.8 $ 8.9 $ 9.4 $ 8.6
Net realized and unrealized (gains) losses [1] (0.8) 1.7 (0.4) 2.0
Purchases and issuances [2] 0.0 0.0 0.0 0.0
Settlements and reductions (4.8) (2.8) (4.8) (2.8)
Balance, end of period 4.2 7.8 4.2 7.8
Net change in unrealized (gains) losses relating to instruments still held at the reporting date [1] 0.1 1.7 0.3 2.0
Affiliate Equity Obligations        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 79.4 91.5 49.2 12.1
Net realized and unrealized (gains) losses [1] 0.0 0.0 0.0 0.0
Purchases and issuances [2] 0.3 50.8 45.9 150.4
Settlements and reductions (42.8) (71.6) (58.2) (91.8)
Balance, end of period 36.9 70.7 36.9 70.7
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 obligations are recorded in Other expenses (net) in the Consolidated Statements of Income.
[2] Includes transfers from Redeemable non-controlling interests.