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Pension and Post-Employment Benefits - Unfunded Defined Benefit Pension Plan (Detail) - German Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Plan net pension charge:      
Service cost $ 0.1 $ 0.1 $ 0.1
Interest cost on PBO 0.1 0.1 0.1
Amortization of actuarial net loss 0.5 1.0 0.8
Net periodic benefit $ 0.7 $ 1.2 $ 1.0
Plan assumptions at December 31, (%):      
Discount rate 3.70% 0.90% 0.40%
Inflation rate 2.25% 2.00% 1.50%
Rate of increase in compensation levels 2.75% 2.75% 2.75%