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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Nov. 15, 2024
Mar. 31, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2024    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 001-32892    
Entity Registrant Name MUELLER WATER PRODUCTS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-3547095    
Entity Address, Address Line One 1200 Abernathy Road N.E.    
Entity Address, Address Line Two Suite 1200    
Entity Address, City or Town Atlanta    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 30328    
City Area Code (770)    
Local Phone Number 206-4200    
Title of 12(b) Security Common Stock, par value $0.01    
Trading Symbol MWA    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   156,252,093  
Entity Public Float     $ 2,466.9
Documents Incorporated by Reference [Text Block] Applicable portions of the Proxy Statement for our upcoming 2025 Annual Meeting of Stockholders of the Company are incorporated by reference into Part III of this Form 10-K.    
Entity Central Index Key 0001350593    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false