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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2018
Nov. 12, 2018
Mar. 31, 2018
Sep. 30, 2017
Document Information [Line Items]        
Document Fiscal Period Focus FY      
Document Period End Date Sep. 30, 2018      
Document Fiscal Year Focus 2018      
Entity Well-known Seasoned Issuer Yes      
Entity Registrant Name Mueller Water Products, Inc.      
Entity Central Index Key 0001350593      
Current Fiscal Year End Date --09-30      
Entity Filer Category Large Accelerated Filer      
Document Type 10-K      
Property, plant and equipment, net $ 150,900,000     $ 122,300,000
Intangible Assets, Net (Including Goodwill) $ 420,200,000     $ 439,300,000
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Amendment Flag false      
Entity Common Stock, Shares Outstanding   157,461,336    
Entity Shell Company false      
Entity Emerging Growth Company false      
Entity Small Business false      
Entity Public Float     $ 1,702,200,000