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Investments - Contractual Maturities of Available-for-Sale (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Amortized Cost    
Due in less than one year $ 125.6  
Due in one to two years 153.2  
Due in three to five years 63.1  
Total 341.9  
Fair Value    
Due in less than one year 125.5  
Due in one to two years 153.1  
Due in three to five years 63.1  
Marketable investments $ 341.7 $ 0.0