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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value Measured On A Recurring Basis - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financial Assets    
Investments in marketable securities $ 36.4 $ 119.3
Derivative financial instruments [1] 1.4 5.8
Financial Liabilities    
Contingent payment arrangements [2] 2.0 1.9
Affiliate equity repurchase obligations [2] 75.4 36.2
Derivative financial instruments [2] 0.0 1.4
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Investments in marketable securities 36.4 119.3
Derivative financial instruments [1] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Affiliate equity repurchase obligations [2] 0.0 0.0
Derivative financial instruments [2] 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Investments in marketable securities 0.0 0.0
Derivative financial instruments [1] 1.4 5.8
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Affiliate equity repurchase obligations [2] 0.0 0.0
Derivative financial instruments [2] 0.0 1.4
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Investments in marketable securities 0.0 0.0
Derivative financial instruments [1] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2] 2.0 1.9
Affiliate equity repurchase obligations [2] 75.4 36.2
Derivative financial instruments [2] $ 0.0 $ 0.0
[1] Amounts are presented within Other assets.
[2] Amounts are presented within Other liabilities.