Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Additional Information (Detail)

v3.8.0.1
Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative asset fair value $ 5.8 $ 7.4
Derivative liability fair value 6.6 3.5
Cash flow hedges reclassified into earnings over next twelve months 0.3  
Foreign exchange currency contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative asset fair value 5.8 7.4
Derivative liability fair value 6.6 3.5
Foreign exchange currency contracts [Member] | Derivatives designated as cash flow hedging instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative aggregate notional amounts 104.9 90.0
Derivative asset fair value 2.9 4.6
Derivative liability fair value 4.0  
Foreign exchange forward contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative aggregate notional amounts $ 435.4 $ 447.2
Freestanding derivatives [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative average remaining maturity period 1 month 1 month
Maximum [Member] | Foreign exchange currency contracts [Member] | Derivatives designated as cash flow hedging instruments [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative maximum remaining maturity period 15 months  
Maximum [Member] | Foreign exchange forward contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative maximum remaining maturity period 12 months 12 months