Employee Benefit Plans - Summary of Pretax Amounts Included in Accumulated Other Comprehensive Loss (Detail) - Pension Benefits [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S.Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss	$ (2.3)	$ (1.3)
Total	(2.3)	(1.3)
Non-U.S.Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net actuarial loss	(43.4)	(31.5)
Unrecognized prior service cost	(0.5)	(0.7)
Total	$ (43.9)	$ (32.2)