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Financial Instruments and Concentration of Credit Risks - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Counterparty Credit Concentration Risk [Line Items]      
Maturity period limit of foreign currency exchange instruments (in months) 3 months    
Net fair value gain (loss) on foreign exchange forward contracts $ (4.4) $ 5.3  
Receivables due from U.S. federal governmental agencies 99.0 94.0  
Difference between carrying amount and fair value of long-term debt 3.0 9.0  
Other income (expense), net      
Counterparty Credit Concentration Risk [Line Items]      
Gain (loss) on foreign exchange forward contracts 15.6 17.3 $ (7.3)
Prepaid Expenses and Other Current Assets      
Counterparty Credit Concentration Risk [Line Items]      
Net fair value gain (loss) on foreign exchange forward contracts 2.2 6.1  
Other Accrued Liabilities      
Counterparty Credit Concentration Risk [Line Items]      
Net fair value gain (loss) on foreign exchange forward contracts (6.6) (0.8)  
Foreign Exchange Contract      
Counterparty Credit Concentration Risk [Line Items]      
Notional amount of foreign exchange forward contracts not designated as hedging instruments $ 940.1 $ 403.9