Other accrued liabilities - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Payrolls and commissions	$ 124.5	$ 84.8
Income taxes	31.4	41.3
Taxes other than income taxes	27.4	23.2
Accrued vacations	22.4	21.1
Operating leases	19.1	26.0
Postretirement	10.2	11.7
Cost reduction	9.4	11.7
Accrued interest	5.8	5.9
Other	58.2	45.9
Total other accrued liabilities	$ 308.4	$ 271.6