Commitments and contingencies - Additional Information (Detail) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) claim	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) site claim location	Sep. 30, 2019 USD ($)
Other Commitments [Line Items]
Number of locations impacted by environmental laws and regulations | location				127
Number of company owned/occupied sites requiring environmental remediation work | site				107
Number of non owned sites liable for a share of clean-up | site				20
Income tax expense	$ (2.7)		$ (43.2)	$ (14.0)	$ (38.4)
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil
Other Commitments [Line Items]
Proceeds from income tax refunds		$ 10.9
Proceeds from prior year income tax refund		9.7
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Interest expense
Other Commitments [Line Items]
Proceeds from prior year income tax refund	0.3	$ 4.6
Income tax expense	$ 0.4
Minimum
Other Commitments [Line Items]
Environmental project, term				2 years
Maximum
Other Commitments [Line Items]
Number of asbestos-related claims (fewer than) | claim	182			182
Environmental project, term				30 years