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Pension and Post-Employment Benefits - Additional Information (Detail) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
United Kingdom Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost, total	$ 0.4	$ 0.3	$ 0.8	$ 0.6
Germany [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost, total	0.1	$ 0.1	0.1	$ 0.1
Europe [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-employment obligations European businesses	$ 4.8		$ 4.8		$ 5.3

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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