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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Reserves for discontinued operations, environmental and restructuring $ 107.5 $ 161.7
Accrued pension and other postretirement benefits 5.8 1.8
Capital loss, foreign tax and other credit carryforwards 11.1 5.5
Net operating loss carryforwards 294.5 311.4
Deferred expenditures capitalized for tax 41.1 39.6
Other accruals and reserves 216.7 163.3
Deferred tax assets 676.7 683.3
Valuation allowance, net (398.7) (335.6)
Deferred tax assets, net of valuation allowance 278.0 347.7
Intangibles, Property, plant and equipment, and Investments, net 401.9 468.1
Deferred tax liabilities 401.9 468.1
Net deferred tax assets (liabilities) $ (123.9) $ (120.4)