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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets    
Accrued liabilities and reserves $ 57.8 $ 59.4
Pension and other post-retirement compensation and benefits 24.6 26.2
Employee compensation and benefits 18.2 18.5
Tax loss and credit carryforwards 729.7 744.5
Interest limitations 67.5 49.9
Total deferred tax assets 897.8 898.5
Valuation allowance 727.2 747.3
Deferred tax assets, net of valuation allowance 170.6 151.2
Deferred tax liabilities    
Property, plant and equipment 10.2 5.3
Goodwill and other intangibles 210.4 209.0
Other liabilities 16.7 16.9
Deferred Tax Liabilities, Gross 237.3 231.2
Total deferred tax liabilities $ 66.7 $ 80.0