Document and Entity Information - USD ($)	9 Months Ended
	Jun. 30, 2017	Jul. 31, 2017	Mar. 31, 2017
Document And Entity Information [Abstract]
Document Fiscal Period Focus	Q3
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
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		158,588,182
Entity Public Float			$ 1,856,526,077