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Supplemental Statement of Operations Information (Details) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Schedule of Statement of Operations Supplemental Disclosures [Line Items]      
Restructuring Reserve $ 1.7 $ 0.9  
Other Nonrecurring Expense 5.1    
Reorganization Items $ 4.3    
Document Period End Date Sep. 30, 2019    
Included in selling, general and administrative expenses:      
Research and development $ 14.3 11.6 $ 12.1
Advertising 7.1 7.1 5.2
Interest expense, net:      
Capitalized interest (3.0)    
Interest rate swap contracts 0.0 0.6 1.9
Deferred financing fees amortization 1.2 1.6 1.8
Other interest expense (0.2) (0.6) (0.6)
Interest Expense 23.3 25.3 24.2
Interest income (3.5) (4.4) (2.0)
Interest expense, net (19.8) (20.9) (22.2)
Other Cost and Expense, Operating 16.3 10.5 10.4
Secured Debt [Member]      
Interest expense, net:      
Debt instrument interest expense 0.0 14.4 19.1
Seven Point Three Seven Five Senior Subordinated Notes [Member]      
Interest expense, net:      
Debt instrument interest expense 24.8 7.5 0.0
Capitalized interest   0.0 0.0
ABL Agreement [Member]      
Interest expense, net:      
Debt instrument interest expense 0.6 0.6 $ 0.8
Mueller One Project [Member]      
Interest expense, net:      
Other Cost and Expense, Operating   $ 4.6  
Middleboro [Domain]      
Schedule of Statement of Operations Supplemental Disclosures [Line Items]      
Restructuring Reserve $ 0.7