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Document and Entity Information (USD $)
 6 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Mar. 31, 2013
Document And Entity Information [Abstract]      
Document Fiscal Period Focus Q2    
Document Period End Date Mar. 31, 2015    
Document Fiscal Year Focus 2015    
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   160,878,406dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 1,484,364,255dei_EntityPublicFloat