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Commitments and contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Environmental Remediation Obligations [Abstract]      
Balance at the beginning of the period $ 97.3 $ 97.6 $ 98.6
Additions charged to expense, net 2.5 1.7 1.6
Payments, net (2.9) (2.0) (2.5)
Changes in currency exchange rates and other     (0.1)
Balance at the end of the period 96.9 97.3 97.6
Amounts recognized in the Consolidated Balance Sheet at the end of the year:      
Current liabilities 3.7 3.8 3.5
Noncurrent liabilities $ 93.2 $ 93.5 $ 94.1
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities Noncurrent Other Liabilities Noncurrent Other Liabilities Noncurrent
Total $ 96.9 $ 97.3 $ 97.6
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Accrued Liabilities, Current, Other Liabilities Noncurrent Accrued Liabilities, Current, Other Liabilities Noncurrent Accrued Liabilities, Current, Other Liabilities Noncurrent