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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Restructuring and Related Activities [Abstract] |  |
Beginning Balance | $ 60.3 |
Charge for the period | 4.1 |
Utilized in the period | (2.6) |
Exchange effect | 7.0 |
Ending Balance | 68.8 |
Due within one year | (5.0) | $ (5.0)
Due after one year | $ 63.8 | $ 55.3

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