Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets
Accrued liabilities and reserves	$ 52.0	$ 54.8
Pension and other post-retirement compensation and benefits	16.6	17.5
Employee compensation and benefits	27.4	27.4
Research and development costs	44.4	36.6
Tax loss and credit carryforwards	728.9	691.4
Interest limitations	231.9	214.0
Total deferred tax assets	1,101.2	1,041.7
Valuation allowance	773.3	739.7
Deferred tax assets, net of valuation allowance	327.9	302.0
Deferred tax liabilities
Property, plant and equipment	11.3	17.1
Goodwill and other intangibles	214.1	177.9
Other liabilities	15.8	21.8
Total deferred tax liabilities	241.2	216.8
Net deferred tax assets	$ 86.7	$ 85.2