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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Investments in marketable securities      
Trading securities $ 50.1   $ 40.5
Fair Value Measured On A Recurring Basis      
Financial Assets      
Cash equivalents 33.0 $ 64.1  
Investments in marketable securities      
Trading securities [1] 50.1 40.5  
Available-for-sale securities [1] 53.5 81.9  
Other investments   3.4  
Foreign currency forward contracts [2] 0.8 0.6  
Financial Liabilities      
Contingent payment arrangements [2] 7.8 8.6  
Affiliate equity obligations [2] 70.7 12.1  
Foreign currency forward contracts [2] 1.2 0.5  
Fair Value Measured On A Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial Assets      
Cash equivalents 33.0 64.1  
Investments in marketable securities      
Trading securities [1] 50.1 40.5  
Available-for-sale securities [1] 53.5 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  
Fair Value Measured On A Recurring Basis | Significant Other Observable Inputs (Level 2)      
Financial Assets      
Cash equivalents 0.0 0.0  
Investments in marketable securities      
Trading securities [1] 0.0 0.0  
Available-for-sale securities [1] 0.0 0.0  
Other investments   0.0  
Foreign currency forward contracts [2] 0.8 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] 1.2 0.5  
Fair Value Measured On A Recurring Basis | Significant Other Unobservable Inputs (Level 3)      
Financial Assets      
Cash equivalents 0.0 0.0  
Investments in marketable securities      
Trading securities [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] 7.8 8.6  
Affiliate equity obligations [2] 70.7 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.