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Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Contingent Payment Arrangements    
Changes in level 3 assets and liabilities    
Balance, beginning of period $ 8.6 $ 10.2
Net realized and unrealized (gains) losses(1) [1] 7.6 (1.6)
Purchases and issuances(2) [2] 0.0 0.0
Settlements and reductions (6.8) 0.0
Balance, end of period 9.4 8.6
Net change in unrealized (gains) losses relating to instruments still held at the reporting date 2.8 (1.6)
Affiliate Equity Obligations    
Changes in level 3 assets and liabilities    
Balance, beginning of period 12.1 62.3
Net realized and unrealized (gains) losses(1) [1] 5.5 3.1
Purchases and issuances(2) [2] 206.1 69.1
Settlements and reductions (174.5) (122.4)
Balance, end of period 49.2 12.1
Net change in unrealized (gains) losses relating to instruments still held at the reporting date $ 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 Imputed interest expense and contingent payment arrangements.
[2] Includes transfers from Redeemable non-controlling interests and other activity.