Pension and other postretirement benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligations for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets	$ 456.0	$ 481.0
Projected benefit obligations for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets	456.6	481.8
Fair value of plan assets for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets	449.8	434.3
Defined benefit plans, annual average Medicare part D subsidy	0.1
Defined contribution plans, costs	$ 23.2	$ 21.7	$ 17.5
Defined Benefit Plan, Equity Securities
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation percentage of securities	26.00%
Fixed Income Securities
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation percentage of securities	74.00%
Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.80%	2.50%
Rate of return	6.70%	7.50%	7.70%
Accumulated benefit obligation	$ 474.1	$ 500.6
Expected employer contribution next fiscal year	$ 1.6
Postretirement Health Care Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.70%	2.30%
Expected employer contribution next fiscal year	$ 2.7
U.S. | Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.95%
Rate of return	5.80%	7.00%
U.S. | Postretirement Health Care Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.69%
Foreign Plan | Pension
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets with accumulated benefit obligation in excess of plan assets	$ 2.0	$ 3.7