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Income Taxes (Components of Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss and other tax carryforwards $ 125.1 $ 129.6
Interest limitation 47.1 43.7
Pension and workers compensation benefits 46.0 42.7
Accrued compensation 16.6 20.2
Accrued liabilities 14.1 19.3
Goodwill and intangible assets 11.4 7.5
Allowance for doubtful accounts 6.4 7.3
Other 7.3 9.4
Total deferred tax assets 274.0 279.7
Valuation allowance (115.2) (126.9)
Net deferred tax assets 158.8 152.8
Deferred tax liabilities:    
Property, plant and equipment (153.8) (165.0)
Other (9.7) (8.5)
Total deferred tax liabilities (163.5) (173.5)
Net deferred tax liabilities (4.7) (20.7)
Valuation allowance 115.2 126.9
Foreign Tax Authority    
Deferred tax assets:    
Valuation allowance (53.6)  
Deferred tax liabilities:    
Net operating loss carryforwards 99.1  
Net operating loss carryforwards, not subject to expiration 30.2  
Tax credit carryforward 30.1  
Valuation allowance 53.6  
State and Local Jurisdiction    
Deferred tax assets:    
Valuation allowance (55.7)  
Deferred tax liabilities:    
Net operating loss carryforwards 501.5  
Capital loss carryforwards 13.6  
Tax credit carryforward 44.1  
Tax credit carryforward, not subject to expiration 32.0  
Valuation allowance 55.7  
State and Local Jurisdiction | Expires in 2019    
Deferred tax liabilities:    
Capital loss carryforwards 4.6  
State and Local Jurisdiction | Expires in 2021    
Deferred tax liabilities:    
Capital loss carryforwards 0.5  
State and Local Jurisdiction | Expires in 2022    
Deferred tax liabilities:    
Capital loss carryforwards 8.5  
Domestic Tax Authority    
Deferred tax assets:    
Valuation allowance (5.9)  
Deferred tax liabilities:    
Capital loss carryforwards 24.6  
Valuation allowance 5.9  
Domestic Tax Authority | Expires in 2019    
Deferred tax liabilities:    
Capital loss carryforwards 6.2  
Domestic Tax Authority | Expires in 2021    
Deferred tax liabilities:    
Capital loss carryforwards 1.1  
Domestic Tax Authority | Expires in 2022    
Deferred tax liabilities:    
Capital loss carryforwards 17.3  
Deferred Income Taxes    
Deferred tax liabilities:    
Net deferred tax liabilities (32.1) (41.9)
Other Noncurrent Assets    
Deferred tax liabilities:    
Deferred tax assets, net $ 27.4 $ 21.2