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Acquisitions (Purchase Price) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 108.4 $ 103.4 $ 100.2
Erie Press Systems EP      
Business Acquisition [Line Items]      
Current assets 6.4    
Current liabilities (6.4)    
Property, plant and equipment 2.9    
Intangible assets 1.8    
Goodwill 5.2    
Deferred income tax liabilities (0.8)    
Total purchase price (including potential contingent consideration) $ 9.1