Accounts payable and accrued liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts payable and accrued liabilities
Accounts payable	$ 218.7	$ 177.2
Accrued sales discounts and rebates	22.5	25.6
Employee benefits	24.7	22.9
Operating lease liabilities	$ 3.9	$ 3.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other	$ 54.3	$ 59.9
Total	$ 324.1	$ 289.4