Pension - Schedule of Pre-Tax Charges Recognized in Accumulated Other Comprehensive Loss (Detail) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax
Net actuarial loss	$ 1.0	$ 79.0
Prior service cost (income)	(0.2)	0.5
Accumulated other comprehensive income	$ 0.8	$ 79.5

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant