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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, 2017
Dec. 31, 2016
Financial Assets    
Cash equivalents $ 40.4 $ 64.1
Investments in marketable securities    
Trading [1] 57.2 40.5
Available-for-sale securities [1] 20.6 81.9
Other investments   3.4
Foreign currency forward contracts [2] 0.2 0.6
Financial Liabilities    
Contingent payment arrangements [2] 9.4 8.6
Affiliate equity obligations [2] 49.2 12.1
Foreign currency forward contracts [2] 0.6 0.5
Level 1    
Financial Assets    
Cash equivalents 40.4 64.1
Investments in marketable securities    
Trading [1] 57.2 40.5
Available-for-sale securities [1] 20.6 81.9
Other investments   3.4
Foreign currency forward contracts [2] 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
Level 2    
Financial Assets    
Cash equivalents 0.0 0.0
Investments in marketable securities    
Trading [1] 0.0 0.0
Available-for-sale securities [1] 0.0 0.0
Other investments   0.0
Foreign currency forward contracts [2] 0.2 0.6
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Affiliate equity obligations [2] 0.0 0.0
Foreign currency forward contracts [2] 0.6 0.5
Level 3    
Financial Assets    
Cash equivalents 0.0 0.0
Investments in marketable securities    
Trading [1] 0.0 0.0
Available-for-sale securities [1] 0.0 0.0
Other investments   0.0
Foreign currency forward contracts [2] 0.0 0.0
Financial Liabilities    
Contingent payment arrangements [2] 9.4 8.6
Affiliate equity obligations [2] 49.2 12.1
Foreign currency forward contracts [2] $ 0.0 $ 0.0
[1] Principally investments in equity securities.
[2] Amounts are presented within Other assets or Other liabilities.