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Post-retirement benefits - Summary of reconciliation (Detail) - Post-employment medical defined benefit plans [member] - Country of domicile [member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]    
Balance at beginning of year $ 46.1 $ 34.2
Current service cost 0.1 0.1
Interest expense 3.9 3.8
Remeasurement losses (gains):    
Experience loss 1.2 3.9
(Gain) loss due to change in financial assumptions (4.5) 2.8
Gain due to change in demographic assumptions (4.5) 0.0
Benefits paid (1.3) (1.7)
Translation adjustments (9.4) 3.0
Balance at end of year $ 31.6 $ 46.1