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Fair Value Measurements - Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis (Detail) - Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Amount [Member]    
Non-derivatives:    
Cash and cash equivalents $ 66.6 $ 75.7
Non-derivatives:    
Long-term debt (including current portion) 0.0 58.6
Finance leases (including current portion) 0.6 1.5
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]    
Derivatives (Level 1 measurement):    
Foreign currency forward exchange contracts 0.2 0.8
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units 12.3 24.6
Fair Value [Member]    
Non-derivatives:    
Cash and cash equivalents 66.6 75.7
Non-derivatives:    
Long-term debt (including current portion) 0.0 58.6
Finance leases (including current portion) 0.6 1.5
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]    
Derivatives (Level 1 measurement):    
Foreign currency forward exchange contracts 0.2 0.8
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units $ 12.3 $ 24.6