Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets
Accrued liabilities and reserves	$ 28.1	$ 23.3
Pension and other post-retirement compensation and benefits	11.6	13.8
Employee compensation and benefits	39.8	28.5
Tax loss and credit carryforwards	191.8	195.8
Other intangibles	33.0	43.5
Interest limitation	39.3	42.7
Other assets	34.0	34.8
Total deferred tax assets	377.6	382.4
Valuation allowance	194.4	196.0
Deferred tax assets, net of valuation allowance	183.2	186.4
Deferred tax liabilities
Property, plant and equipment	30.5	28.9
Goodwill and other intangibles	303.8	322.2
Other liabilities	34.2	21.0
Total deferred tax liabilities	368.5	372.1
Net deferred tax liabilities	$ 185.3	$ 185.7