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Organization Restructuring (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Beginning balance     $ 0.9 $ 3.3
Restructuring $ 2.5 $ 2.6 12.6 8.4
Payments     (4.6) (6.3)
Mueller One Project [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring     $ 5.5 $ 4.4