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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, 2023
Dec. 31, 2022
Carrying Amount [Member]    
Non-derivatives:    
Cash and cash equivalents $ 207.2 $ 147.1
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]    
Derivatives (Level 1 measurement):    
Derivative asset 1.0 0.0
Derivatives (Level 1 measurement):    
Foreign currency forward exchange contracts 0.0 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):    
Derivative asset 3.2 2.7
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units 17.4 26.4
Fair Value [Member]    
Non-derivatives:    
Cash and cash equivalents 207.2 147.1
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]    
Derivatives (Level 1 measurement):    
Derivative asset 1.0 0.0
Derivatives (Level 1 measurement):    
Foreign currency forward exchange contracts 0.0 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):    
Derivative asset 3.2 2.7
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-financial liabilities (Level 3 measurement):    
Stock equivalent units $ 17.4 $ 26.4