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Marketable Investments - Current and Noncurrent (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Reported under the following captions on the consolidated balance sheet:    
Marketable investments $ 311.9 $ 0.0
Cash and cash equivalents    
Reported under the following captions on the consolidated balance sheet:    
Marketable investments 168.1  
Non-current marketable investments    
Reported under the following captions on the consolidated balance sheet:    
Marketable investments $ 143.8