Document and Entity Information (USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2014	Sep. 30, 2013	Apr. 30, 2014	Mar. 31, 2013
Document And Entity Information [Abstract]
Document Fiscal Period Focus	Q2
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
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			159,321,403
Entity Public Float				$ 921,010,549