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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2016
Nov. 11, 2016
Mar. 31, 2016
Sep. 30, 2015
Document Information [Line Items]        
Document Fiscal Period Focus FY      
Document Period End Date Sep. 30, 2016      
Document Fiscal Year Focus 2016      
Entity Well-known Seasoned Issuer No      
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 $ 155,100,000     $ 148,900,000
Intangible Assets, Net (Including Goodwill) $ 486,000,000     $ 507,300,000
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Amendment Flag false      
Entity Common Stock, Shares Outstanding   161,732,282    
Entity Public Float     $ 1,575,896,511