Other Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income (Loss) and Income Tax Expense Allocated to Each Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss, Before Tax Amount	$ 125.4	$ 22.5	$ (31.8)
Other comprehensive loss, Income Tax	34.7	(0.5)	(9.3)
Other comprehensive income (loss)	90.7	23.0	(22.5)
Translation adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss, Before Tax Amount	(11.1)	27.8	7.0
Other comprehensive income (loss)	(11.1)	27.8	7.0
Adjustment for net periodic pension and OPEB plan cost
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss, Before Tax Amount	123.0	10.3	(39.8)
Other comprehensive loss, Income Tax	31.3	3.1	(9.3)
Other comprehensive income (loss)	91.7	7.2	(30.5)
Changes in Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss, Before Tax Amount	13.5	(15.6)	1.0
Other comprehensive loss, Income Tax	3.4	(3.6)
Other comprehensive income (loss)	$ 10.1	$ (12.0)	$ 1.0