Restructuring and Other Charges - Reconciliation of Restructuring Liability (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Beginning Balance		$ 4.0	$ 5.4
Provision		32.4	9.3	$ 10.4
Cash Expenditures	[1]	(6.7)	(10.7)
Ending Balance		29.7	4.0	5.4
Workforce Reduction Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		3.2	5.4
Provision		19.4	8.5
Cash Expenditures	[1]	(6.4)	(10.7)
Ending Balance		16.2	3.2	5.4
Other [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance		0.8	0.0
Provision		13.0	0.8
Cash Expenditures	[1]	(0.3)	0.0
Ending Balance		$ 13.5	$ 0.8	$ 0.0

[1] Cash expenditures primarily related to severance charges.