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Pension and Post-Employment Benefits - Defined Benefit Pension Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Plan net pension (credit)/charge:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
United Kingdom Plan [Member]      
Plan assumptions at December 31, (%):      
Discount rate 4.91% 1.84% 1.36%
Inflation rate 2.85% 3.55% 2.35%
Rate of return on plan assets - overall on bid-value 4.00% 2.30% 2.00%
Plan asset allocation by category (%):      
Total plan asset allocation by category 100.00% 100.00% 100.00%
United Kingdom Plan [Member] | Cash [Member]      
Plan asset allocation by category (%):      
Total plan asset allocation by category 4.00% 13.00% 4.00%
United Kingdom Plan [Member] | Defined Benefit Plan Debt Securities And Insurance Contracts [Member]      
Plan asset allocation by category (%):      
Total plan asset allocation by category 96.00% 82.00% 86.00%
United Kingdom Plan [Member] | Defined Benefit Plan Equity Securities And Real Estate [Member]      
Plan asset allocation by category (%):      
Total plan asset allocation by category 0.00% 5.00% 10.00%
United Kingdom [Member]      
Plan net pension (credit)/charge:      
Service cost $ 3.4    
Interest cost on PBO 19.1    
Expected return on plan assets (24.5)    
Amortization of prior service cost/(credit) 0.5    
Amortization of actuarial net losses (1.6)    
United Kingdom [Member] | United Kingdom Plan [Member]      
Plan net pension (credit)/charge:      
Service cost 2.2 $ 1.6 $ 1.2
Interest cost on PBO 10.1 7.6 11.2
Expected return on plan assets (16.0) (15.5) (17.8)
Amortization of prior service cost/(credit) 0.5 0.3 (0.5)
Amortization of actuarial net losses 0.0 1.6 0.9
Settlement event 0.0 (0.3) 0.0
Net periodic benefit $ (3.2) $ (4.7) $ (5.0)