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Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 16.1 $ 9.7 $ 9.7
Goodwill, Additions during period 6.4    
Acquired Intangible Assets, including Goodwill 17.4 0.0  
Amortization of Intangible Assets (3.6) (3.3)  
Intangible Assets, Net (Including Goodwill) 70.6 56.8 60.1
Payments to Acquire Businesses, Gross 22.0    
Future Amortization Expense, Year One 3.8    
Future Amortization Expense, Year Two 3.8    
Future Amortization Expense, Year Three 3.8    
Future Amortization Expense, Year Four 3.8    
Future Amortization Expense, Year Five 3.8    
Timber licenses      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 43.9 47.1 $ 50.4
Amortization of Intangible Assets (3.2) (3.3)  
Timber Licenses, Initial Value 91.3    
Technology-Based Intangible Assets [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 10.6 $ 0.0  
Finite-lived Intangible Assets Additions during period 11.0    
Amortization of Intangible Assets $ 0.4