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Fair Value of Financial Instruments - Time and Call Deposits (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Investments in time and call deposits      
Cash equivalents $ 0.0    
Short-term investments 210.6   $ 201.2
Unrealized gains (losses) on available-for-sale securities $ 0.0 $ 0.0  
Minimum      
Investments in time and call deposits      
Maturity of time deposits 1 month    
Period of ability to redeem invested amounts on call deposits 31 days    
Maximum      
Investments in time and call deposits      
Maturity of time deposits 12 months    
Period of ability to redeem invested amounts on call deposits 95 days