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Commitments and Contingencies (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
claims
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating leases      
Rental expense $ 4.9 $ 5.2 $ 3.5
Due in 2018 4.1    
Due in 2019 3.3    
Due in 2020 2.4    
Due in 2021 1.8    
Due in 2022 and thereafter $ 4.0    
Asbestos Litigation [Member]      
Operating leases      
Total resolved claims, by means of settlement or dismissal | claims 37,594    
Total cost of resolution $ 10.2    
Resolution costs paid by insurance carrier 100.00%    
Confirmed insurance coverage $ 140.0    
Asbestos Litigation [Member] | Brandon Drying Fabrics, Inc. [Member]      
Operating leases      
Total resolved claims, by means of settlement or dismissal | claims 7,707    
Resolution costs paid by insurance carrier 100.00%