Benefit Plans - Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Non-current liabilities	$ (135.6)	$ (131.7)
Defined accumulated benefit obligation plans	121.8	119.3
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(5.2)	(4.4)
Non-current liabilities	(114.5)	(112.8)
Benefit obligations in excess of the fair value of plan assets	(119.7)	(117.2)
Post-retirement
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(1.1)	(1.1)
Non-current liabilities	(10.0)	(10.3)
Benefit obligations in excess of the fair value of plan assets	$ (11.1)	$ (11.4)