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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Carrying value property, plant and equipment, net   $ 288.0   $ 316.1
Land under purchase options not yet recorded   10.8    
Gain related to capital expenditures incurred to date   0.6 $ 0.0  
Montgomery Lease        
Property, Plant and Equipment [Line Items]        
Gain related to capital expenditures incurred to date $ 5.4   $ 8.1  
Closed Facilities | U.S.        
Property, Plant and Equipment [Line Items]        
Carrying value property, plant and equipment, net   $ 1.1   $ 1.1