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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, 2019
Dec. 31, 2018
Financial Assets    
Investments in marketable securities $ 59.4 $ 119.3
Derivative financial instruments [1] 7.9 5.8
Financial Liabilities    
Contingent payment arrangements [2]   1.9
Affiliate equity repurchase obligations [2] 19.8 36.2
Derivative financial instruments [2] 1.0 1.4
Level 1    
Financial Assets    
Investments in marketable securities 24.4 119.3
Derivative financial instruments [1] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2]   0.0
Affiliate equity repurchase obligations [2] 0.0 0.0
Derivative financial instruments [2] 0.0 0.0
Level 2    
Financial Assets    
Investments in marketable securities 35.0 0.0
Derivative financial instruments [1] 7.9 5.8
Financial Liabilities    
Contingent payment arrangements [2]   0.0
Affiliate equity repurchase obligations [2] 0.0 0.0
Derivative financial instruments [2] 1.0 1.4
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]   1.9
Affiliate equity repurchase obligations [2] 19.8 36.2
Derivative financial instruments [2] $ 0.0 $ 0.0
[1]
Amounts are presented within Other assets.
[2]
Amounts are presented within Other liabilities.