Other accrued liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Payrolls and commissions	$ 117.1	$ 108.1
Operating leases	70.0
Cost-reduction	47.5	75.8
Accrued vacations	31.7	41.2
Income taxes	28.6	32.3
Taxes other than income taxes	18.3	31.2
Postretirement	13.6	14.8
Accrued interest	11.8	13.8
Other	34.6	32.8
Total other accrued liabilities	$ 373.2	$ 350.0