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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Reserves for discontinued operations, environmental and restructuring $ 161.7 $ 188.3
Accrued pension and other postretirement benefits 1.8 2.4
Capital loss, foreign tax and other credit carryforwards 5.5 7.5
Net operating loss carryforwards 311.4 227.0
Deferred expenditures capitalized for tax 39.6 18.7
Other 163.3 163.6
Deferred tax assets 683.3 607.5
Valuation allowance, net (335.6) (303.3)
Deferred tax assets, net of valuation allowance 347.7 304.2
Intangibles, Property, plant and equipment, and Investments, net 468.1 380.0
Deferred tax liabilities 468.1 380.0
Net deferred tax assets (liabilities) $ (120.4) $ (75.8)