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Organization (Narrative) (Details)
$ in Millions
3 Months Ended
Dec. 31, 2023
USD ($)
business_segments
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Segment Reporting Information [Line Items]        
Restructuring $ 7.8 $ 0.7 $ 6.6 $ 3.3
Restructuring Reserve, Accrual Adjustment 6.6 (3.7)    
Gain (Loss) on Sale of Properties   4.0    
Restructuring and other charges 6.6 (3.7)    
Pension costs (benefits) other then service $ 1.0 $ 0.9    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%    
Number of Reportable Segments | business_segments 2      
Other Sundry Liabilities, Noncurrent $ 3.9      
Proceeds from Other Equity, Gross Amount 4.8      
Intercompany Loan related to NMTC 12.2      
Investment Fund Contribution for NMTC 16.5      
Sub-CDE loan from NMTC 16.2      
Cybersecurity Related        
Segment Reporting Information [Line Items]        
Restructuring Reserve, Accrual Adjustment 1.5      
Mueller Co. [Member]        
Segment Reporting Information [Line Items]        
Restructuring and other charges $ 0.2 $ 0.0