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	Jun. 30, 2025	Dec. 31, 2024
Carrying Amount [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Emission Trading Scheme Credits [Member]
Derivatives (Level 1 measurement):
Derivatives asset	$ 2.2	$ 3.9
Carrying Amount [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivatives asset	1.7	1.5
Carrying Amount [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration	24.5	20.1
Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Emission Trading Scheme Credits [Member]
Derivatives (Level 1 measurement):
Derivatives asset	2.2	3.9
Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivatives asset	1.7	1.5
Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Acquisition-related contingent consideration	$ 24.5	$ 20.1