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Pension and Post-Employment Benefits - Defined Benefit Pension Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Plan net pension (credit)/charge:      
Pension scheme settlement   $ 92.4  
Other Nonoperating Income (Expense), Total $ (0.6) 9.6 $ 10.5
One Time pension scheme settlement charge 0.0 $ 155.6 $ 0.0
United Kingdom Plan [Member]      
Plan assumptions at December 31, (%):      
Discount rate   5.18% 4.59%
Inflation rate   2.85% 2.70%
Rate of return on plan assets - overall on bid-value   4.20% 4.25%
Plan asset allocation by category (%):      
Total plan asset allocation by category   100.00% 100.00%
United Kingdom Plan [Member] | Cash [Member]      
Plan asset allocation by category (%):      
Total plan asset allocation by category   100.00% 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   0.00% 96.00%
United Kingdom [Member] | United Kingdom Plan [Member]      
Plan net pension (credit)/charge:      
Service cost/(credit) 1.5 $ (4.9) $ 3.4
Interest cost on PBO 0.0 18.6 19.6
Expected return on plan assets 0.0 (25.9) (25.2)
Amortization of prior service cost 0.0 16.8 0.5
Amortization of actuarial net losses 0.0 0.0 (1.6)
Recycling of residual reserves 0.0 138.8 0.0
Net periodic cost/(benefit) 1.5 143.4 (3.3)
Pension scheme settlement charge 0.0 155.6 0.0
Release of historic cumulative translation adjustments 0.0 (0.7) 0.0
Pension scheme settlement 0.0 138.1 0.0
Tax relating to the recycling of residual reserves 0.0 (34.7) 0.0
Tax relating to historic cumulative translation adjustments 0.0 (11.0) 0.0
Pension scheme settlement $ 0.0 $ 92.4 $ 0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense), Total
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense), Total
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense), Total    
Other Nonoperating Income (Expense), Total $ 0.0 $ (7.3) $ (6.7)
One Time pension scheme settlement charge 0.0 116.7 0.0
United Kingdom [Member] | United Kingdom Plan [Member] | Selling General And Administrative Expenses [Member]      
Plan net pension (credit)/charge:      
Service cost/(credit) 1.5 (4.9) 3.4
United Kingdom [Member] | United Kingdom Plan [Member] | Other Nonoperating Income (Expense) [Member]      
Plan net pension (credit)/charge:      
Amortization of prior service cost 0.0 0.0 0.5
United Kingdom [Member] | United Kingdom Plan [Member] | Pension Scheme Settlement Charge [Member]      
Plan net pension (credit)/charge:      
Amortization of prior service cost 0.0 16.8 0.0
Recycling of residual reserves 0.0 138.8 0.0
Tax relating to the amortization of prior service cost 0.0 (4.2) 0.0
Tax relating to the recycling of residual reserves (0.0) (34.7) 0.0
United Kingdom [Member] | Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | United Kingdom Plan [Member]      
Plan net pension (credit)/charge:      
Recycling of residual reserves 0.0 138.8 0.0
Release of historic cumulative translation adjustments 0.0 (0.7) 0.0
Pension scheme settlement 0.0 138.1 0.0
Tax relating to the recycling of residual reserves 0.0 (34.7) 0.0
Tax relating to historic cumulative translation adjustments 0.0 (11.0) 0.0
Pension scheme settlement $ 0.0 $ 92.4 $ 0.0