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Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair value of assets and liabilities measured on recurring basis    
Short-term Investments $ 23.2 $ 360.7
Forward contracts 3.3 11.0
Total 26.5 371.7
Accumulated other comprehensive loss associated with foreign exchange rate forward contracts (0.4) (1.2)
Fair value measurements recurring basis | Level 1    
Fair value of assets and liabilities measured on recurring basis    
Short-term Investments 23.2 360.7
Total 23.2 360.7
Fair value measurements recurring basis | Level 2    
Fair value of assets and liabilities measured on recurring basis    
Forward contracts 3.3 11.0
Total $ 3.3 $ 11.0