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 (Parenthetical) (Detail) - Pension Benefits [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	[1]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Settlement transfer to third party, obligation	$ 19.4
Settlement transfer to third party, assets	$ 19.4

[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