Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions by employer to pension plans	$ 7.7
Percentage increase in health care benefit cost	5.90%
Percentage decrease in health care benefits for successive year	0.20%
Estimated future percentage of health care benefits	4.50%
Defined contribution pension plan expense	$ 11.7	$ 10.6	$ 8.3
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, year one	28.3
Estimated benefit payments, year two	29.3
Estimated benefit payments, year three	29.6
Estimated benefit payments, year four	30.8
Estimated benefit payments, year five	31.4
Estimated benefit payments, five years thereafter	163.0
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, year one	2.7
Estimated benefit payments, year two	2.4
Estimated benefit payments, year three	2.4
Estimated benefit payments, year four	2.1
Estimated benefit payments, year five	2.1
Estimated benefit payments, five years thereafter	$ 10.2