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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value Measured On A Recurring Basis - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Financial Assets    
Cash equivalents $ 48,100,000 $ 40,400,000
Investments in marketable securities 144,100,000 77,800,000
Derivative financial instruments [1] 1,000,000 200,000
Financial Liabilities    
Contingent payment arrangements 4,300,000 [2] 9,400,000
Affiliate equity repurchase obligations 28,700,000 [2] 49,200,000
Derivative financial instruments [2] 4,500,000 600,000
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Cash equivalents 48,100,000 40,400,000
Investments in marketable securities 144,100,000 77,800,000
Derivative financial instruments [1] 0 0.0
Financial Liabilities    
Contingent payment arrangements 0 [2] 0
Affiliate equity repurchase obligations 0 [2] 0
Derivative financial instruments [2] 0 0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Cash equivalents 0 0
Investments in marketable securities 0 0
Derivative financial instruments [1] 1,000,000 200,000
Financial Liabilities    
Contingent payment arrangements 0 [2] 0
Affiliate equity repurchase obligations 0 [2] 0
Derivative financial instruments [2] 4,500,000 600,000
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Cash equivalents 0 0
Investments in marketable securities 0 0
Derivative financial instruments [1] 0 0
Financial Liabilities    
Contingent payment arrangements 4,300,000 [2] 9,400,000
Affiliate equity repurchase obligations 28,700,000 [2] 49,200,000
Derivative financial instruments [2] $ 0 $ 0
[1] Amounts are presented within Other investments and assets.
[2] Amounts are presented within Other liabilities.