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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
Dec. 31, 2021
Dec. 31, 2020
Carrying Amount [Member]    
Non-derivatives:    
Cash and cash equivalents $ 141.8 $ 105.3
Non-derivatives:    
Finance leases (including current portion) 0.1 0.6
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 1.2 0.5
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Emission Trading Scheme Credits [Member]    
Derivatives (Level 1 measurement):    
Emissions Trading Scheme credits 3.9
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units 17.3 17.2
Fair Value [Member]    
Non-derivatives:    
Cash and cash equivalents 141.8 105.3
Non-derivatives:    
Finance leases (including current portion) 0.1 0.6
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 1.2 0.5
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Emission Trading Scheme Credits [Member]    
Derivatives (Level 1 measurement):    
Emissions Trading Scheme credits 3.9
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units $ 17.3 $ 17.2