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Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2012
Loss Contingencies [Line Items]        
Loss contingency accrual $ 15.1 $ 16.1    
Current portion of contingency reserves (3.4) (3.4)    
Long-term portion of contingency reserves 11.7 12.7    
Other operating charges and credits [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, Period Increase (Decrease) 0.0 0.0 $ (3.2)  
Reserve for Environmental Costs [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, Period Increase (Decrease) (1.2) (0.7) (0.5)  
Loss contingency accrual 15.0 15.9 $ 16.6 $ 13.6
Hardboard Siding Reserves        
Loss Contingencies [Line Items]        
Loss contingency accrual $ 0.1 $ 0.2