Pension and Other Employee Benefits - Reconciliation of Benefit Obligation, Fair Value of Plan Assets and Funded Status of Respective Defined Benefit (Pension) and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the balance sheet consist of:
Total non-current liabilities		$ 29.9	$ 35.4
Pension Benefits [Member]
Change in benefit obligation:
Obligation at beginning of year		48.3	42.2	$ 63.2
Service cost		0.7	0.7	0.5
Interest cost		0.2	0.3	0.6
Contributions		0.2	0.2	0.2
Settlement transfer to third party	[1]			(19.4)
Actuarial (gains) losses		(0.6)	2.4	(0.4)
Amendments		(0.7)	0.9	(0.7)
Foreign exchange effect		(2.7)	4.0	(0.2)
Benefits paid		(2.2)	(2.4)	(1.6)
Obligation at end of year		43.2	48.3	42.2
Change in plan assets:
Fair value of plan assets, beginning of year		12.9	11.4	31.2
Settlement transfer to third party	[1]			(19.4)
Actual return on plan assets		1.2	0.6	(0.7)
Contributions		0.5	0.6	0.5
Foreign exchange effect		(0.5)	1.1	0.2
Benefits paid		(0.8)	(0.8)	(0.4)
Fair value of plan assets, end of year		13.3	12.9	11.4
Unfunded status		29.9	35.4	30.8
Amounts recognized in the balance sheet consist of:
Total non-current liabilities		$ 29.9	$ 35.4	$ 30.8

[1] For the year ended December 31, 2019, represents settlement transfer to a third party for $19.4 million related to the Company's Swiss Plan