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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value Measured on a Recurring Basis - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial Assets    
Investments in marketable securities $ 119.3 $ 77.8
Derivative financial instruments 5.8 [1] 0.2
Financial Liabilities    
Contingent payment arrangements 1.9 [2] 9.4
Affiliate equity repurchase obligations 36.2 [2] 49.2
Derivative financial instruments 1.4 [2] 0.6
Level 1    
Financial Assets    
Investments in marketable securities 119.3 77.8
Derivative financial instruments 0.0 [1] 0.0
Financial Liabilities    
Contingent payment arrangements 0.0 [2] 0.0
Affiliate equity repurchase obligations 0.0 [2] 0.0
Derivative financial instruments 0.0 [2] 0.0
Level 2    
Financial Assets    
Investments in marketable securities 0.0 0.0
Derivative financial instruments 5.8 [1] 0.2
Financial Liabilities    
Contingent payment arrangements 0.0 [2] 0.0
Affiliate equity repurchase obligations 0.0 [2] 0.0
Derivative financial instruments 1.4 [2] 0.6
Level 3    
Financial Assets    
Investments in marketable securities 0.0 0.0
Derivative financial instruments 0.0 [1] 0.0
Financial Liabilities    
Contingent payment arrangements 1.9 [2] 9.4
Affiliate equity repurchase obligations 36.2 [2] 49.2
Derivative financial instruments $ 0.0 [2] $ 0.0
[1] Amounts are presented within Other assets.
[2] Amounts are presented within Other liabilities.