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Acquisition - Purchase Price Allocation (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Goodwill $ 183.0 $ 182.6 $ 180.1
Net assets acquired $ 0.0 13.2 $ 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