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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
Jun. 30, 2018
Dec. 31, 2017
Financial Assets    
Cash equivalents $ 30.0 $ 40.4
Investments [1] 84.1 77.8
Foreign currency forward contracts [1] 1.0 0.2
Financial Liabilities    
Contingent payment arrangements [2] 4.2 9.4
Affiliate equity obligations [2] 36.9 49.2
Foreign currency forward contracts [2] 1.1 0.6
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Cash equivalents 30.0 40.4
Investments [1] 84.1 77.8
Foreign currency forward contracts [1] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Affiliate equity obligations [2] 0.0 0.0
Foreign currency forward contracts [2] 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Cash equivalents 0.0 0.0
Investments [1] 0.0 0.0
Foreign currency forward contracts [1] 1.0 0.2
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Affiliate equity obligations [2] 0.0 0.0
Foreign currency forward contracts [2] 1.1 0.6
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Cash equivalents 0.0 0.0
Investments [1] 0.0 0.0
Foreign currency forward contracts [1] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2] 4.2 9.4
Affiliate equity obligations [2] 36.9 49.2
Foreign currency forward contracts [2] $ 0.0 $ 0.0
[1] Amounts are presented within Investments and other assets.
[2] Amounts are presented within Other liabilities in the Consolidated Condensed Balance Sheets.