Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Accrued liabilities and reserves	$ 54.8	$ 58.8
Pension and other post-retirement compensation and benefits	17.5	20.1
Employee compensation and benefits	27.4	28.6
Research and development costs	36.6	28.4
Tax loss and credit carryforwards	691.4	769.4
Interest limitations	214.0	168.4
Total deferred tax assets	1,041.7	1,073.7
Valuation allowance	739.7	816.6
Deferred tax assets, net of valuation allowance	302.0	257.1
Deferred tax liabilities
Property, plant and equipment	17.1	17.9
Goodwill and other intangibles	177.9	149.7
Other liabilities	21.8	16.3
Total deferred tax liabilities	216.8	183.9
Net deferred tax assets	$ 85.2	$ 73.2