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Document and Entity Information - USD ($)
 9 Months Ended
Jun. 30, 2016
Jul. 31, 2016
Mar. 31, 2016
Document And Entity Information [Abstract]      
Document Fiscal Period Focus Q3    
Document Period End Date Jun. 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-Q    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   161,685,150  
Entity Public Float     $ 1,560,136,849