Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Accrued liabilities and reserves	$ 58.8	$ 68.1
Pension and other post-retirement compensation and benefits	20.1	19.4
Employee compensation and benefits	28.6	26.5
Research and development costs	28.4	18.1
Tax loss and credit carryforwards	769.4	752.4
Interest limitations	168.4	104.9
Total deferred tax assets	1,073.7	989.4
Valuation allowance	816.6	756.9
Deferred tax assets, net of valuation allowance	257.1	232.5
Deferred tax liabilities
Property, plant and equipment	17.9	18.1
Goodwill and other intangibles	149.7	213.0
Other liabilities	16.3	18.7
Total deferred tax liabilities	183.9	249.8
Net deferred tax assets	$ 73.2
Total deferred tax liabilities		$ (17.3)