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Income Taxes (Components of Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss and other tax carryforwards $ 125.2 $ 145.9
Accrued liabilities 12.9 20.5
Pension and workers compensation benefits 21.9 33.2
Goodwill and intangible assets 24.4 19.0
Interest limitation 11.5 18.2
Allowance for doubtful accounts 6.5 7.2
Accrued compensation 8.1 10.1
Other 10.8 9.8
Total deferred tax assets 221.3 263.9
Valuation allowance (116.3) (143.9)
Net deferred tax assets 105.0 120.0
Deferred tax liabilities:    
Property, plant and equipment (99.2) (103.8)
Other (5.9) (4.2)
Total deferred tax liabilities (105.1) (108.0)
Net deferred tax liabilities (0.1)  
Net deferred tax assets   12.0
Valuation allowance 116.3 143.9
Domestic Tax Authority    
Deferred tax assets:    
Valuation allowance (6.4)  
Deferred tax liabilities:    
Net operating loss carryforwards 46.5  
Tax credit carryforward 9.0  
Valuation allowance 6.4  
Foreign Tax Authority    
Deferred tax assets:    
Valuation allowance (39.3)  
Deferred tax liabilities:    
Net operating loss carryforwards 42.6  
Net operating loss carryforwards, not subject to expiration 11.8  
Tax credit carryforward 26.5  
Valuation allowance 39.3  
State and Local Jurisdiction    
Deferred tax assets:    
Valuation allowance (70.6)  
Deferred tax liabilities:    
Net operating loss carryforwards 612.1  
Tax credit carryforward 35.8  
Tax credit carryforward, not subject to expiration 25.4  
Valuation allowance 70.6  
Other Noncurrent Liabilities    
Deferred tax liabilities:    
Net deferred tax liabilities (11.9) (4.2)
Other Noncurrent Assets    
Deferred tax liabilities:    
Net deferred tax assets $ 11.8 $ 16.2