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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 11, 2017
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross $ 56.5 $ 46.8    
Accumulated Amortization 31.8 25.3    
Intangible Assets, Net 56.7 53.5    
Impairment of intangible assets   16.2    
Selling and Administrative Expenses        
Finite-Lived Intangible Assets [Line Items]        
Amortization Expense 6.5 7.3 $ 18.2  
Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 0.5 0.3    
Accumulated Amortization 0.2 0.2    
Patents        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 40.8 40.8    
Accumulated Amortization 26.9 22.2    
Customer relationships (1)        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 10.6 3.3    
Accumulated Amortization $ 2.0 0.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       $ 3.3
Finite-Lived Intangible Asset, Useful Life 5 years      
Unpatented technologies (1) (2)        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross $ 4.4 2.4    
Accumulated Amortization 2.7 2.2    
Other (1)        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Gross 0.2 0.0    
Accumulated Amortization 0.0 0.0    
Trademarks        
Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 32.0 $ 32.0