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Fair Value of Financial Instruments - Time and Call Deposits (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Investments in time and call deposits          
Cash equivalents $ 0.0   $ 0.0    
Short-term investments 162.8   162.8   $ 201.2
Unrealized gains (losses) on available-for-sale securities $ 0.0 $ 0.0 $ 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