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Acquisition - Purchase Price Allocation (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]      
Goodwill $ 182.6 $ 180.1 $ 167.0
Net assets acquired 13.2 $ 0.0 $ 0.0
Dynaloy, LLC      
Business Acquisition [Line Items]      
Accounts receivable 1.0    
Other current assets 0.1    
Inventories 1.4    
Properties and Equipment, net 2.4    
Goodwill 5.0    
Intangible assets 3.7    
Other current liabilities (0.4)    
Net assets acquired $ 13.2