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Related party disclosures - Summary of Total Compensation of Key Management Personnel (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [abstract]      
Short-term employment benefits $ 22.0 $ 20.1 $ 18.6
Contributions to defined contribution pension plans 0.5 0.4 0.5
Equity compensation benefits 18.6 16.4 15.8
Total compensation of key management personnel $ 41.1 $ 36.9 $ 34.9