Mueller Water Products (MWA) 10-Q 3 Feb 23 2023 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2022	Jan. 31, 2023
Document And Entity Information [Abstract]
Document Fiscal Period Focus	Q1
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2023
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 Current Reporting Status	Yes
Entity Emerging Growth Company	false
Amendment Flag	false
Entity Common Stock, Shares Outstanding		156,264,139
Entity Small Business	false
Title of 12(b) Security	Common stock, par value $0.01
Trading Symbol	MWA
Security Exchange Name	NYSE

Cover Page Document

Cover Page Document - shares	3 Months Ended
	Dec. 31, 2022	Jan. 31, 2023
Cover Page [Abstract]
Entity Incorporation, State or Country Code	DE
Document Type	10-Q
Document Type	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-32892
Entity Registrant Name	MUELLER WATER PRODUCTS, INC.
Entity Tax Identification Number	20-3547095
Entity Address, Address Line One	1200 Abernathy Road N.E.
Entity Address, Address Line Two	Suite 1200
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30328
City Area Code	(770)
Local Phone Number	206-4200
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		156,264,139
Trading Symbol	MWA
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Assets:
Receivables, net	$ 201.9	$ 228
Inventories	314	278.7
Other current assets	30.4	26.8
Total current assets	671.9	680
Property, plant and equipment, net	302.9	301.6
Goodwill	100	98.6
Identifiable intangible assets	355.6	361.2
Other noncurrent assets	56.2	56.7
Total assets	1,486.6	1,498.1
Liabilities and stockholders' equity:
Current portion of long-term debt	0.9	0.8
Accounts payable	103.5	122.8
Accrued liabilities	109.2	117.4
Total current liabilities	213.6	241
Long-term debt	446.1	446.1
Deferred income taxes	85.8	86.3
Other noncurrent liabilities	53.3	55.4
Total liabilities	$ 798.8	$ 828.8
Series A common stock, shares authorized	600,000,000
Common Stock, Shares, Outstanding	156,208,077	155,844,138
Common stock	$ 1.6	$ 1.6
Additional paid-in capital	1,271	1,279.6
Accumulated deficit	(544.8)	(567.3)
Accumulated other comprehensive income (loss)	(40)	(44.6)
Total equity	687.8	669.3
Total liabilities and stockholders' equity	1,486.6	1,498.1
Accounts Receivable, Allowance for Credit Loss, Current	6.1	5.6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 125.6	$ 146.5

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 314.8	$ 272.3
Cost of sales	221.6	184.7
Gross profit	93.2	87.6
Operating expenses:
Selling, general and administrative	62.9	56.3
Restructuring and other charges	(3.7)	2.4
Total operating expenses	59.2	58.7
Operating income	34	28.9
Non-operating expense:
Pension costs (benefits) other then service	0.9	(1)
Interest expense, net	3.7	4.3
Gain (Loss) on Extinguishment of Debt	(4)	0
Net other expense	4.6	3.3
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	29.4	25.6
Income tax expense (benefit)	6.9	6.2
Net income (loss)	$ 22.5	$ 19.4
Net income (loss) per basic share:
Earnings Per Share, Basic	$ 0.14	$ 0.12
Net income (loss) per diluted share:
Earnings Per Share, Diluted	$ 0.14	$ 0.12
Weighted average shares outstanding:
Basic, in shares	156,400	158,000
Diluted, in shares	157,000	158,900
Dividends declared per share, in dollars per share	$ 0.061	$ 0.058

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net income (loss)	$ 22.5	$ 19.4
Other comprehensive income (loss):
Other comprehensive (income) loss, pension, before tax	0.9	0.4
Other comprehensive income (loss), pension income tax effects	(0.3)	(0.1)
Foreign currency translation	4	5.7
Other comprehensive income (loss), net of tax	4.6	6
Comprehensive income (loss), net of tax	$ 27.1	$ 25.4

Consolidated Statement Of Stock

Consolidated Statement Of Stockholders' Equity - USD ($) $ in Millions	Total	Stock-based Compensation Related	Common stock	Common stock Stock-based Compensation Related	Accumulated deficit	Accumulated deficit Stock-based Compensation Related	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Stock-based Compensation Related	Additional Paid-in Capital [Member]
Common stock, value, issued	$ 1.6
Other comprehensive income (loss), net of tax	$ 4.6
Common stock, dividends, per share, declared	$ 0.061
Balance at Sep. 30, 2022	$ 669.3		$ 1.6		$ (567.3)		$ (44.6)		$ 1,279.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(9.5)		0		0		0		(9.5)
Stock-based compensation	1.8		0		0		0		1.8
Shares retained for employee taxes		$ (1.5)		$ 0		$ 0		$ 0
Stock issued under stock compensation plans	0.6		0		0		0		0.6
Net income (loss)	22.5		0				0		0
Balance at Dec. 31, 2022	687.8		$ 1.6		$ (544.8)		$ (40)		$ 1,271
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	22.5
Common stock, value, issued	$ 1.6

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net cash provided by (used in) operating activities
Net income (loss)	$ 22.5	$ 19.4
Adjustments to reconcile net income (loss) to income (loss) from continuing operations:
Depreciation	7.8	8
Amortization	7	7.2
Gain (Loss) on Extinguishment of Debt	(4)	0
Stock-based compensation expense	1.8	2
Retirement plans	1.1	(0.7)
Deferred income taxes	(0.9)	3.6
Inventory write-down	1.2	3.5
Other noncash income (expense)	(0.5)	(1)
Changes in assets and liabilities, net of acquisitions:
Receivables	26.4	31.9
Inventories	(36.1)	(28.3)
Other current assets and other noncurrent assets	(3.6)	(0.8)
Accounts payable	(19.6)	(8.4)
Other current liabilities	(8.4)	(12.8)
Long-term liabilities	(2.2)	(5.8)
Net cash provided by (used in) operating activities, total	(6.5)	19.8
Investing activities:
Capital expenditures	(9.9)	(11)
Payments for (Proceeds from) Other Investing Activities	0	0.2
Proceeds from sales of assets	5.1	0
Net cash provided by (used in) investing activities, total	(4.8)	(10.8)
Financing activities:
Dividends paid	(9.5)	(9.2)
Shares retained for employee taxes	(1.5)	(1.9)
Common stock issued	0.6	0.7
Stock repurchased under buyback program	0	(20)
Other	(0.1)	(0.1)
Net cash provided by (used in) financing activities, total	(10.5)	(30.5)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0.9	1.3
Cash and cash equivalents at beginning of period		227.5
Cash and cash equivalents at end of period		207.3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	125.6
Interest Paid, Excluding Capitalized Interest, Operating Activities	8.6	10
Income Taxes Paid	0.2	0.4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	$ (20.9)	$ (20.2)

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note [Text Block]	Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) is as follows: Pension, net of tax Foreign currency translation Total (in millions) Balance at September 30, 2022 $ (36.3) $ (8.3) $ (44.6) Current period other comprehensive income 0.6 4.0 4.6 Balance at December 31, 2022 $ (35.7) $ (4.3) $ (40.0)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Accumulated other comprehensive income (loss) is as follows: Pension, net of tax Foreign currency translation Total (in millions) Balance at September 30, 2022 $ (36.3) $ (8.3) $ (44.6) Current period other comprehensive income 0.6 4.0 4.6 Balance at December 31, 2022 $ (35.7) $ (4.3) $ (40.0)

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tabular)	3 Months Ended
	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Loss	Accumulated other comprehensive income (loss) is as follows: Pension, net of tax Foreign currency translation Total (in millions) Balance at September 30, 2022 $ (36.3) $ (8.3) $ (44.6) Current period other comprehensive income 0.6 4.0 4.6 Balance at December 31, 2022 $ (35.7) $ (4.3) $ (40.0)

Supplemental Balance Sheet Info

Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Statement of Financial Position [Abstract]
Goodwill	$ 100	$ 98.6

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ (35.7)	$ (36.3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	0.6
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(4.3)	(8.3)
Foreign currency translation	4
Accumulated other comprehensive income (loss)	(40)	$ (44.6)
Other comprehensive income (loss), net of tax	$ 4.6

Organization

Organization	3 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization and Basis of Presentation Mueller Water Products, Inc., a Delaware corporation, together with its consolidated subsidiaries, operates in two business segments: Water Flow Solutions and Water Management Solutions. These segments are based on a management reorganization that became effective October 1, 2021. Water Flow Solutions’ product portfolio includes iron gate valves, specialty valves and service brass products. Water Management Solutions’ product and service portfolio includes fire hydrants, repair and installation, natural gas, metering, leak detection, pressure control and software products. The “Company,” “we,” “us” or “our” refer to Mueller Water Products, Inc. and its subsidiaries. With regard to the Company’s segments, “we,” “us” or “our” may also refer to the segment being discussed. On June 14, 2021, we acquired all the outstanding capital stock of i2O Water Ltd (“i2O”), a provider of pressure management solutions to more than 100 water companies in 45 countries. During the three months ended December 31, 2021, we recorded a purchase price adjustment of $0.2 million, resulting in a final purchase price of $19.5 million. Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), which require us to make certain estimates and assumptions in recording assets, liabilities, sales and expenses as well as in the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. All significant intercompany balances and transactions have been eliminated. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements included in our Annual Report on Form 10-K for the year ended September 30, 2022. In our opinion, all normal and recurring adjustments that we consider necessary for a fair financial statement presentation have been made. The condensed consolidated balance sheet at September 30, 2022 was derived from our audited financial statements, but it does not include all disclosures required by GAAP. Our business is seasonal as a result of the impact of cold weather conditions. Net sales and operating income historically have been lowest in the three month periods ending December 31 and March 31 when the northern United States and all of Canada generally face weather conditions that restrict significant construction activity. Unless the context indicates otherwise, whenever we refer to a particular year, we mean our fiscal year ended or ending September 30 in that particular calendar year. Recently Adopted Accounting Pronouncements In December 2022, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848” (“ASU 2022-06”). ASU 2022-06 defers the sunset date for applying the reference rate reform relief in ASC 848 to December 31, 2024 from December 31, 2022. ASU 2022-06 became effective immediately upon issuance. In March 2020, the FASB issued ASU No. 2020-04, "Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting" (“ASU 2020-04”). This guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference the London Inter Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued due to reference rate reform. ASU 2020-04 is effective from March 12, 2020, but may be adopted prospectively from a date within an interim period subsequent to March 12, 2020. We evaluated our contracts and the optional expedients provided by ASU 2020-04. We adopted this standard on October 1, 2021 and there was no material impact to our financial statements. In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes” (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by clarifying and amending existing guidance related to the recognition of franchise tax, the evaluation of a step up in the tax basis of goodwill, and the effects of enacted changes in tax laws or rates in the effective tax rate computation, among other clarifications. ASU 2019-12 was effective for public business entities for fiscal years beginning after December 15, 2020, including interim periods within that fiscal year, with early adoption permitted. We adopted this standard on October 1, 2021 and there was no material impact to our financial statements. Restructuring

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Notes)	3 Months Ended
	Dec. 31, 2022
Revenue from Contracts with Customers [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers We recognize revenue when control of promised products or services is transferred to our customers, in amounts that reflect the consideration to which we expect to be entitled in exchange for those products or services. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, the payment terms are identified, the contract has commercial substance and collectability of consideration is probable. We determine the appropriate revenue recognition for our contracts with customers by analyzing the type, terms and conditions of each contract or arrangement with a customer. Disaggregation of Revenue Refer to Note 8. for disaggregation of our revenues from contracts with customers by reportable segment and by geographical region, which we believe best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Geographical region represents the location of the customer. Contract Asset and Liability Balances Differences in the timing of revenue recognition, billing and cash collection result in customer receivables, advance payments and billings in excess of revenue recognized. Customer receivables include amounts billed and currently due from customers as well as unbilled amounts (i.e., contract assets). Amounts are billed in accordance with contractual terms and unbilled amounts arise when the timing of billing differs from the timing of revenue recognized. Advance payments and billings in excess of revenue are recognized and recorded as deferred revenue, the majority of which is classified as current based on the timing when we expect to recognize revenue. We include current deferred revenue within Other current liabilities in the accompanying consolidated balance sheets. Deferred revenue represents contract liabilities and is recorded when customers remit cash payments in advance of our satisfaction of performance obligations under contractual arrangements. Contract liabilities are reversed when the performance obligation is satisfied and revenue is recognized. The table below represents the balances of our customer receivables and deferred revenue. December 31, September 30, 2022 2022 (in millions) Billed receivables $ 203.5 $ 230.5 Unbilled receivables 4.5 3.1 Gross customer receivables 208.0 233.6 Allowance for credit losses (6.1) (5.6) Receivables, net $ 201.9 $ 228.0 Deferred revenue $ 8.4 $ 8.1 Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. Our performance obligations are satisfied at a point in time for sales of equipment or over time for our software hosting and leak detection monitoring services. Performance obligations are supported by customer contracts, which provide frameworks for the nature of the distinct products or services. The transaction price is adjusted for our estimate of variable consideration which may include discounts and rebates. To estimate variable consideration, we apply the expected value or the most likely amount method, based on whichever method most appropriately predicts the amount of consideration we expect to receive. The method applied is typically based on historical experience and known trends. We constrain the amounts of variable consideration that are included in the transaction price, to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur or when uncertainties around the variable consideration are resolved. We exclude from the measurement of the transaction price all taxes assessed by a governmental authority. We have elected to use the practical expedient to not adjust the transaction price of a contract for the effects of a significant financing component if, at the inception of the contract, we expect that the period between when we transfer a product or service to a customer and when a customer remits payment will be one year or less. Revenue for the sale of our products is recognized when the obligations of the terms of our contract are satisfied, which is when the customer is able to direct the use of and obtain substantially all of the benefits from the product, which generally occurs upon shipment when control of the product transfers to the customer. We offer warranties to our customers which provide assurance that the products provided will function as intended and comply with any agreed-upon specifications. These warranties cannot be purchased separately from us. Costs to Obtain or Fulfill a Contract Shipping and handling costs associated with freight activities after the customer has obtained control of a product are included in cost of sales at the time the related revenue is recognized. We incur certain incremental costs to obtain a contract, which primarily relate to incremental sales commissions. Our sales commissions are paid based on a combination of orders and shipments, and we reserve the right to claw back any commissions in case of product returns, cancellations or lost collections. As the expected benefit associated with these incremental costs is generally one year or less based on the nature of the product sold and benefits received, we have applied a practical expedient and therefore do not capitalize the related costs and expense them as incurred.

Income Taxes

Income Taxes	3 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below. Three months ended December 31, 2022 2021 U.S. federal statutory income tax rate 21.0 % 21.0 % Adjustments to reconcile to the effective tax rate: State income taxes, net of federal benefit 3.4 3.9 Excess tax benefits related to stock-based compensation 0.7 (1.0) Tax credits (1.6) (1.2) Global Intangible Low-Taxed Income 0.8 0.3 Foreign income tax rate differential (1.6) (0.7) Nondeductible compensation 0.5 — Valuation allowances (0.2) 1.4 Other 0.5 0.5 Effective income tax rate 23.5 % 24.2 %
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below. Three months ended December 31, 2022 2021 U.S. federal statutory income tax rate 21.0 % 21.0 % Adjustments to reconcile to the effective tax rate: State income taxes, net of federal benefit 3.4 3.9 Excess tax benefits related to stock-based compensation 0.7 (1.0) Tax credits (1.6) (1.2) Global Intangible Low-Taxed Income 0.8 0.3 Foreign income tax rate differential (1.6) (0.7) Nondeductible compensation 0.5 — Valuation allowances (0.2) 1.4 Other 0.5 0.5 Effective income tax rate 23.5 % 24.2 %

Borrowing Arrangements

Borrowing Arrangements	3 Months Ended
	Dec. 31, 2022
Long-Term Debt and Lease Obligation [Abstract]
Borrowing Arrangements	Borrowing Arrangements The components of our long-term debt are as follows: December 31, September 30, 2022 2022 (in millions) 4.0% Senior Notes $ 450.0 $ 450.0 Finance leases 1.4 1.6 Total borrowings 451.4 451.6 Less: deferred financing costs (4.4) (4.7) Less: current portion (0.9) (0.8) Long-term debt $ 446.1 $ 446.1 ABL Agreement. Our asset-based lending agreement, as amended, (“ABL”) is provided by a consortium of banking institutions and consists of a revolving credit facility for up to $175.0 million in borrowing that expires on July 29, 2025. The ABL allows up to $25.0 million of swing line loans and up to $60.0 million of letters of credit. The ABL permits us to increase the size of the credit facility by an additional $150.0 million in certain circumstances subject to adequate borrowing base availability. Borrowings under the ABL bear interest at a floating rate equal to LIBOR plus an applicable margin range of 200 to 225 basis points, or a base rate, as defined in the ABL, plus an applicable margin range of from 100 to 125 basis points. At December 31, 2022 the applicable margin for LIBOR based loans w as 200 basis points and for base rate loans was 100 basis points. The ABL is subject to mandatory prepayments if total outstanding borrowings under the ABL are greater than the aggregate commitments under the revolving credit facility or if we dispose of overdue accounts receivable in certain circumstances. The borrowing base under the ABL is equal to the sum of (a) 85% of the value of eligible accounts receivable and (b) the lesser of (i) 70% of the value of eligible inventory or (ii) 85% of the net orderly liquidation value of eligible inventory, less certain reserves. Prepayments can be made at any time without penalty. Substantially all of our United States subsidiaries are borrowers under the ABL and are jointly and severally liable for outstanding borrowings. Our obligations under the ABL are secured by a first-priority perfected lien on all of our United States inventory, accounts receivable, certain cash balances and other supporting assets. The ABL includes a commitment fee for any unused borrowing capacity of 37.5 basis points per annum. Borrowings are not subject to any financial maintenance covenants unless excess availability is less than the greater of $17.5 million and 10% of the Loan Cap as defined in the ABL. Excess availability based on December 31, 2022 data was $162.4 million, as reduced by $12.4 million of outstanding letters of credit and $0.2 million of accrued fees and expenses. 4.0% Senior Unsecured Notes. On May 28, 2021, we privately issued $450.0 million of 4.0% Senior Unsecured Notes (“4.0% Senior Notes”), which mature on June 15, 2029 and bear interest at 4.0%, paid semi-annually in June and December. We capitalized $5.5 million of financing costs which are being amortized over the term of the 4.0% Senior Notes using the effective interest method. Proceeds from the 4.0% Senior Notes, along with cash on hand, were used to redeem our previously existing 5.5% Senior Notes. Substantially all of our United States subsidiaries guarantee the 4.0% Senior Notes, which are subordinate to borrowings under our ABL. Based on quoted market prices, which is a Level 1 measurement, the outstanding 4.0% Senior Notes had a fair value of $395.8 million at December 31, 2022.

Retirement Plans

Retirement Plans	3 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The components of net periodic benefit cost for our pension plans are presented below. Three months ended December 31, 2022 2021 (in millions) Service cost $ 0.2 $ 0.3 Pension costs (benefits) other than service: Interest cost 3.5 2.4 Expected return on plan assets (3.5) (3.8) Amortization of actuarial net loss 0.9 0.4 Pension costs (benefits) other than service 0.9 (1.0) Net periodic costs (benefits) $ 1.1 $ (0.7) The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss).

Stock-based Compensation Plans

Stock-based Compensation Plans	3 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Share-based Payment Arrangement [Text Block]	Stock-based Compensation Plans We grant various forms of stock-based compensation, including market-based restricted stock units (“MRSUs”), restricted stock units, stock options and performance-based restricted stock units (“PRSUs”) under our Amended and Restated 2006 Mueller Water Products, Inc. Stock Incentive Plan (the “2006 Stock Plan”), Phantom Plan instruments under our Mueller Water Products, Inc. 2012 Phantom Plan, and Employee stock purchase plan instruments under our 2006 Employee Stock Purchase Plan. Grants issued during the three months ended December 31, 2022 are as follows: Number granted Weighted average grant date fair value per instrument Total grant date fair value Quarter ended December 31, 2022 MRSUs 166,284 $ 15.08 $ 2.5 PRSUs 166,284 $ 11.41 $ 1.9 Restricted stock units 228,692 $ 11.39 $ 2.6 Phantom Plan instruments 267,093 $ 11.41 $ 3.0 Non-qualified stock options 573,279 $ 3.31 $ 1.9 Employee stock purchase plan instruments 47,463 $ 2.56 $ 0.1 $ 12.0 An MRSU award represents a target number of units that may be paid out at the end of a three-year award cycle based on a calculation of our relative total shareholder return (“TSR”) performance as compared with the TSR of a selected peer group. Settlements, in our common shares, will range from zero to two times the number of MRSUs granted, depending on our TSR performance relative to that of the peer group. Compensation expense attributed to MRSUs is based on the fair value of the awards on their respective grant dates, as determined using a Monte Carlo model. The assumptions used to determine the grant date fair value are indicated below. November 29, 2022 Variables used in determining grant date fair value: Dividend yield 2.20 % Risk-free rate 4.20 % Expected term (in years) 2.8 The expected dividend yield is based on our estimated annual dividend and our stock price history at the grant date. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield in effect at the grant date with a term equal to the expected term. The expected term represents the average period of time the units are expected to be outstanding. At December 31, 2022, the outstanding Phantom Plan instruments had a fair v alue of $10.76 pe r instrument and our liability for Phantom Plan instruments was $1.4 million and is included within Other current and Other noncurrent liabilities. Stock options generally vest ratably over three years on each anniversary date. Compensation expense attributed to stock options is based on the fair value of the awards on their respective grant dates, using a Black-Scholes model. The assumptions used to determine the grant date fair value are indicated below. November 29, 2022 Dividend yield 1.80 % Risk-free rate 3.89 % Expected term (in years) 6.00 The expected dividend yield is based on our estimated annual dividend and our stock price history at the grant date. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield in effect at the grant date with a term equal to the expected term. The expected term represents the average period of time the options are expected to be outstanding. A PRSU award consists of a target number of units that may be paid out at the end of a three-year award cycle. Settlements, in our common shares, will range from zero to two times the number of PRSUs granted, depending on our financial performance relative to the targets. We issued 282,472 shares of common stock to settle PRSUs vested during the three months ended December 31, 2022. Additionally, we issued 128,048 and 37,734 shares of common stock to settle restricted stock units vested and stock options exer cised, respectively, during the three months ended December 31, 2022. Additionally, 131,670 shares of common stock were surrendered to us to pay the withholding obligations of equity award participants. Operating income included stock-based compensation expense of $2.7 million and $2.6 million during the three months ended December 31, 2022 and 2021, respectively. At December 31, 2022, there was approximately $15.8 million of unrecognized compensation expense related to stock-based compensation arrangemen ts, which will be expensed through December 2025. We excluded 1,274,371 and 277,344 stock-based compensation instruments from the calculations of diluted earnings per share in the three months ended December 31, 2022 and 2021, respectively, since their inclusion would have been antidilutive.

Supplemental Balance Sheet In_2

Supplemental Balance Sheet Information	3 Months Ended
	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Supplemental Balance Sheet Information	Supplemental Balance Sheet Information Selected supplemental asset information is presented below. December 31, September 30, 2022 2022 (in millions) Inventories: Purchased components and raw materials $ 200.2 $ 181.8 Work in process, net 56.0 56.8 Finished goods, net 57.8 40.1 Total inventories $ 314.0 $ 278.7 Other current assets: Prepaid expenses $ 18.1 $ 14.6 Non-trade receivables 2.3 1.6 Maintenance and repair supplies and tooling 3.2 2.8 Income taxes 0.8 0.8 Workers’ compensation reimbursement receivable 2.5 2.6 Other current assets 3.5 4.4 Total other current assets $ 30.4 $ 26.8 Property, plant and equipment: Land $ 5.7 $ 5.7 Buildings 86.5 87.6 Machinery and equipment 453.4 456.0 Construction in progress 110.1 104.7 Total property, plant and equipment 655.7 654.0 Accumulated depreciation (352.8) (352.4) Property, plant and equipment, net $ 302.9 $ 301.6 Other noncurrent assets: Operating lease right-of-use assets $ 25.1 $ 26.0 Maintenance and repair supplies and tooling 20.4 20.4 Workers’ compensation reimbursement receivable 3.6 3.6 Pension asset 0.4 0.6 Note receivable 1.8 1.7 Deferred financing fees 0.9 1.0 Other noncurrent assets 4.0 3.4 Total other noncurrent assets $ 56.2 $ 56.7 Selected supplemental liability information is presented below. December 31, September 30, 2022 2022 (in millions) Other current liabilities: Compensation and benefits $ 27.1 $ 40.2 Customer rebates 21.3 16.2 Income taxes payable 15.1 7.5 Warranty accrual 6.5 6.5 Deferred revenue 8.4 8.1 Refund liability 4.5 4.2 Taxes other than income taxes 3.6 4.4 Operating lease liabilities 4.7 4.4 Workers’ compensation accrual 4.8 4.6 CARES Act payroll tax liabilities — 4.4 Restructuring liabilities 0.7 3.3 Environmental liabilities 0.7 0.7 Interest payable 0.8 5.3 Other current liabilities 11.0 7.6 Total other current liabilities $ 109.2 $ 117.4 Other noncurrent liabilities: Operating lease liabilities $ 21.6 $ 22.4 Warranty accrual 3.4 4.2 Transition tax liability 4.1 4.1 Uncertain tax position liability 4.8 4.7 NMTC liability 3.9 3.9 Workers’ compensation accrual 6.5 6.5 Asset retirement obligation 3.6 3.6 Deferred development grant 2.5 2.5 Other noncurrent liabilities 2.9 3.5 Total other noncurrent liabilities $ 53.3 $ 55.4 Goodwill Goodwill is tested for impairment at the reporting unit level (operating segment or one level below an operating segment) on an annual basis each September 1 st and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. The following table summarizes information concerning our goodwill, all of which is within our Water Management Solutions segment, during the three months ended December 31, 2022, in millions. Balance at September 30, 2022: Goodwill $ 822.7 Accumulated impairment (724.1) Net goodwill 98.6 Activity during the three months ended December 31, 2022: Change in foreign currency exchange rates 1.4 Balance at December 31, 2022 $ 100.0

Segment Information

Segment Information	3 Months Ended
	Dec. 31, 2022
Segment Reporting, Measurement Disclosures [Abstract]
Segment Reporting Disclosure [Text Block]	Segment Information We have two reportable segments, Water Flow Solutions and Water Management Solutions. Water Flow Solutions’ product portfolio includes iron gate valves, specialty valves and service brass products. Water Management Solutions’ product and service portfolio includes fire hydrants, repair and installation, natural gas, metering, leak detection, pressure control and software products. Summarized financial information for our segments is presented below. Three months ended December 31, 2022 2021 (in millions) Net sales, excluding intercompany: Water Flow Solutions $ 165.6 $ 154.9 Water Management Solutions 149.2 117.4 $ 314.8 $ 272.3 Operating income (loss): Water Flow Solutions $ 24.2 $ 31.3 Water Management Solutions 19.6 11.4 Corporate (9.8) (13.8) $ 34.0 $ 28.9 Depreciation and amortization: Water Flow Solutions $ 7.7 $ 7.4 Water Management Solutions 7.0 7.7 Corporate 0.1 0.1 $ 14.8 $ 15.2 Strategic reorganization and other (benefits) charges: Water Flow Solutions $ — $ — Water Management Solutions — 0.1 Corporate (3.7) 2.3 $ (3.7) $ 2.4 Capital expenditures: Water Flow Solutions $ 7.8 $ 9.4 Water Management Solutions 2.1 1.6 Corporate — — $ 9.9 $ 11.0 Water Flow Solutions disaggregated net revenue: Central $ 44.0 $ 40.5 Northeast 31.3 30.0 Southeast 33.4 37.3 West 49.2 38.1 United States 157.9 145.9 Canada 4.4 7.9 Other international locations 3.3 1.1 $ 165.6 $ 154.9 Water Management Solutions disaggregated net revenue: Central $ 41.5 $ 28.8 Northeast 31.2 24.3 Southeast 33.3 25.5 West 29.1 24.7 United States 135.1 103.3 Canada 7.3 7.6 Other international locations 6.8 6.5 $ 149.2 $ 117.4

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies We are involved in various legal proceedings that have arisen in the normal course of operations, including the proceedings summarized below. We provide for costs relating to these matters when a loss is probable and the amount is reasonably estimable. Legal and administrative costs related to these matters are expensed as incurred. The effect of the outcome of these matters on our financial statements cannot be predicted with certainty as any such effect depends on the amount and timing of the resolution of such matters. Other than the litigation described below, we do not believe that any of our outstanding litigation would have a materially adverse effect on our financial position, results of operations, cash flows or liquidity. Environmental. We are subject to a wide variety of laws and regulations concerning the protection of the environment, both with respect to the operations at many of our properties and with respect to remediating environmental conditions that may exist at our own or other properties. We accrue for environmental expenses resulting from existing conditions that relate to past operations when the costs are probable and reasonably estimable. In the acquisition agreement pursuant to which a predecessor to Tyco International plc, now Johnson Controls International plc (“Tyco”), sold our businesses to a previous owner in August 1999, Tyco agreed to indemnify us and our affiliates, among other things, for all “Excluded Liabilities.” Excluded Liabilities include, among other things, substantially all liabilities relating to the time prior to August 1999, including environmental liabilities. The indemnity survives indefinitely. Tyco’s indemnity does not cover liabilities to the extent caused by us or the operation of our businesses after August 1999, nor does it cover liabilities arising with respect to businesses or sites acquired after August 1999. Since 2007, Tyco has engaged in multiple corporate restructurings, split-offs and divestitures. While none of these transactions directly affects the indemnification obligations of the Tyco indemnitors under the 1999 acquisition agreement, the result of such transactions is that the assets of, and control over, such Tyco indemnitors has changed. Should any of these Tyco indemnitors become financially unable or fail to comply with the terms of the indemnity, we may be responsible for such obligations or liabilities. On July 13, 2010, Rohcan Investments Limited, the former owner of property leased by Mueller Canada Ltd. and located in Milton, Ontario, filed a lawsuit against Mueller Canada Ltd. and its directors seeking C$10.0 million in damages arising from the defendants’ alleged environmental contamination of the property and breach of lease. On November 15, 2022, Mueller Canada Ltd. agreed to pay Rohcan Investments Limited C$1.5 million in settlement of all liability, damages and other claims related to the lawsuit. We have paid the settlement amount, and are pursuing indemnification from a former owner for certain potential liabilities that are alleged in this lawsuit. The purchaser of U.S. Pipe has been identified as a “potentially responsible party” (“PRP”) under the Comprehensive Environmental Response, Compensation and Liability Act in connection with a former manufacturing facility operated by U.S. Pipe that was in the vicinity of a proposed Superfund site located in North Birmingham, Alabama. Under the terms of the acquisition agreement relating to our sale of U.S. Pipe, we agreed to indemnify the purchaser for certain environmental liabilities, including those arising out of the former manufacturing site in North Birmingham. Accordingly, the purchaser tendered the matter to us for indemnification, which we accepted. Ultimate liability for the site will depend on many factors that have not yet been determined, including the determination of the Environmental Protection Agency’s remediation costs, the number and financial viability of the other PRPs (there are four other PRPs currently) and the determination of the final allocation of the costs among the PRPs. Since the amounts of such costs cannot be reasonably estimated at this time, no amounts have been accrued for this matter at December 31, 2022. The COVID-19 Pandemic. The pandemic has caused, and is likely to continue to cause, severe economic, market and other disruptions to the U.S. and global economies. We have taken action and continue to counter such disruption, and work to protect the safety of our employees. While the extent to which the pandemic continues to affect our results will depend on future developments, the pandemic could result in material effects to our future financial position, results of operations, cash flows and liquidity. Mass Shooting Event at our Mueller Co. Facility in Albertville, Alabama. On June 15, 2021, we experienced a mass shooting event at our Mueller Co. facility in Albertville, Alabama. Various claims arising from the event have been filed to date, and we anticipate that additional claims may be made and that liability under such claims, if any, is not expected to have a material adverse effect on our results of operations or cash flows. However, the outcome of these claims, or legal proceedings, and related effects arising from this event cannot be predicted with certainty. Indemnification . We are a party to contracts in which it is common for us to agree to indemnify third parties for certain liabilities that arise out of or relate to the subject matter of the contract. In some cases, this indemnity extends to related liabilities arising from the negligence of the indemnified parties, but usually excludes any liabilities caused by gross negligence or willful misconduct. We cannot estimate the potential amount of future payments under these indemnities until events arise that would trigger a liability under the indemnities. Additionally, in connection with the sale of assets and the divestiture of businesses, such as the divestitures of U.S. Pipe and Anvil, we may agree to indemnify buyers and related parties for certain losses or liabilities incurred by these parties with respect to: (i) the representations and warranties made by us to these parties in connection with the sale and (ii) liabilities related to the pre-closing operations of the assets or business sold. Indemnities related to pre-closing operations generally include certain environmental and tax liabilities and other liabilities not assumed by these parties in the transaction. Indemnities related to the pre-closing operations of sold assets or businesses normally do not represent additional liabilities to us, but simply serve to protect these parties from potential liability associated with our obligations existing at the time of the sale. As with any liability, we have accrued for those pre-closing obligations that are considered probable and reasonably estimable. Should circumstances change, increasing the likelihood of payments related to a specific indemnity, we will accrue a liability when future payment is probable and the amount is reasonably estimable. Other Matters. We monitor and analyze our warranty experience and costs periodically and may revise our accruals as necessary. Critical factors in our analyses include warranty terms, specific claim situations, general incurred and projected failure rates, the nature of product failures, product and labor costs, and general business conditions. We are party to a number of lawsuits arising in the ordinary course of business, including product liability cases for products manufactured by us or third parties. While the results of litigation cannot be predicted with certainty, we believe that the final outcome of such other litigation is not likely to have a materially adverse effect on our financial position, results of operations, cash flows or liquidity.

Subsequent Events

Subsequent Events	3 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 25, 2023, our Board of Directors declared a dividend of $0.061

Organization Restructuring Roll

Organization Restructuring Rollforward (Tables)	3 Months Ended
	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs [Table Text Block]

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable	e table below represents the balances of our customer receivables and deferred revenue. December 31, September 30, 2022 2022 (in millions) Billed receivables $ 203.5 $ 230.5 Unbilled receivables 4.5 3.1 Gross customer receivables 208.0 233.6 Allowance for credit losses (6.1) (5.6) Receivables, net $ 201.9 $ 228.0 Deferred revenue $ 8.4 $ 8.1

Income Taxes Rate Reconciliatio

Income Taxes Rate Reconciliation (Tables)	3 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The reconciliation between the U.S. federal statutory income tax rate and the effective income tax rate is presented below. Three months ended December 31, 2022 2021 U.S. federal statutory income tax rate 21.0 % 21.0 % Adjustments to reconcile to the effective tax rate: State income taxes, net of federal benefit 3.4 3.9 Excess tax benefits related to stock-based compensation 0.7 (1.0) Tax credits (1.6) (1.2) Global Intangible Low-Taxed Income 0.8 0.3 Foreign income tax rate differential (1.6) (0.7) Nondeductible compensation 0.5 — Valuation allowances (0.2) 1.4 Other 0.5 0.5 Effective income tax rate 23.5 % 24.2 %

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	3 Months Ended
	Dec. 31, 2022
Long-Term Debt and Lease Obligation [Abstract]
Components of Long-Term Debt	The components of our long-term debt are as follows: December 31, September 30, 2022 2022 (in millions) 4.0% Senior Notes $ 450.0 $ 450.0 Finance leases 1.4 1.6 Total borrowings 451.4 451.6 Less: deferred financing costs (4.4) (4.7) Less: current portion (0.9) (0.8) Long-term debt $ 446.1 $ 446.1

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost	The components of net periodic benefit cost for our pension plans are presented below. Three months ended December 31, 2022 2021 (in millions) Service cost $ 0.2 $ 0.3 Pension costs (benefits) other than service: Interest cost 3.5 2.4 Expected return on plan assets (3.5) (3.8) Amortization of actuarial net loss 0.9 0.4 Pension costs (benefits) other than service 0.9 (1.0) Net periodic costs (benefits) $ 1.1 $ (0.7)

Stock-based Compensation Plans

Stock-based Compensation Plans (Tables)	3 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	Stock options generally vest ratably over three years on each anniversary date. Compensation expense attributed to stock options is based on the fair value of the awards on their respective grant dates, using a Black-Scholes model. The assumptions used to determine the grant date fair value are indicated below. November 29, 2022 Dividend yield 1.80 % Risk-free rate 3.89 % Expected term (in years) 6.00

Supplemental Balance Sheet In_3

Supplemental Balance Sheet Information (Tables)	3 Months Ended
	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Schedule Of Selected Supplemental Balance Sheet Information [Table Text Block]	Selected supplemental asset information is presented below. December 31, September 30, 2022 2022 (in millions) Inventories: Purchased components and raw materials $ 200.2 $ 181.8 Work in process, net 56.0 56.8 Finished goods, net 57.8 40.1 Total inventories $ 314.0 $ 278.7 Other current assets: Prepaid expenses $ 18.1 $ 14.6 Non-trade receivables 2.3 1.6 Maintenance and repair supplies and tooling 3.2 2.8 Income taxes 0.8 0.8 Workers’ compensation reimbursement receivable 2.5 2.6 Other current assets 3.5 4.4 Total other current assets $ 30.4 $ 26.8 Property, plant and equipment: Land $ 5.7 $ 5.7 Buildings 86.5 87.6 Machinery and equipment 453.4 456.0 Construction in progress 110.1 104.7 Total property, plant and equipment 655.7 654.0 Accumulated depreciation (352.8) (352.4) Property, plant and equipment, net $ 302.9 $ 301.6 Other noncurrent assets: Operating lease right-of-use assets $ 25.1 $ 26.0 Maintenance and repair supplies and tooling 20.4 20.4 Workers’ compensation reimbursement receivable 3.6 3.6 Pension asset 0.4 0.6 Note receivable 1.8 1.7 Deferred financing fees 0.9 1.0 Other noncurrent assets 4.0 3.4 Total other noncurrent assets $ 56.2 $ 56.7
Schedule of Accrued Liabilities	Selected supplemental liability information is presented below. December 31, September 30, 2022 2022 (in millions) Other current liabilities: Compensation and benefits $ 27.1 $ 40.2 Customer rebates 21.3 16.2 Income taxes payable 15.1 7.5 Warranty accrual 6.5 6.5 Deferred revenue 8.4 8.1 Refund liability 4.5 4.2 Taxes other than income taxes 3.6 4.4 Operating lease liabilities 4.7 4.4 Workers’ compensation accrual 4.8 4.6 CARES Act payroll tax liabilities — 4.4 Restructuring liabilities 0.7 3.3 Environmental liabilities 0.7 0.7 Interest payable 0.8 5.3 Other current liabilities 11.0 7.6 Total other current liabilities $ 109.2 $ 117.4 Other noncurrent liabilities: Operating lease liabilities $ 21.6 $ 22.4 Warranty accrual 3.4 4.2 Transition tax liability 4.1 4.1 Uncertain tax position liability 4.8 4.7 NMTC liability 3.9 3.9 Workers’ compensation accrual 6.5 6.5 Asset retirement obligation 3.6 3.6 Deferred development grant 2.5 2.5 Other noncurrent liabilities 2.9 3.5 Total other noncurrent liabilities $ 53.3 $ 55.4

Intangible Assets, Goodwill and

Intangible Assets, Goodwill and Other (Tables)	3 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes information concerning our goodwill, all of which is within our Water Management Solutions segment, during the three months ended December 31, 2022, in millions. Balance at September 30, 2022: Goodwill $ 822.7 Accumulated impairment (724.1) Net goodwill 98.6 Activity during the three months ended December 31, 2022: Change in foreign currency exchange rates 1.4 Balance at December 31, 2022 $ 100.0

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Dec. 31, 2022
Segment Reporting, Measurement Disclosures [Abstract]
Schedule Of Selected Supplemental Balance Sheet Information	mmarized financial information for our segments is presented below. Three months ended December 31, 2022 2021 (in millions) Net sales, excluding intercompany: Water Flow Solutions $ 165.6 $ 154.9 Water Management Solutions 149.2 117.4 $ 314.8 $ 272.3 Operating income (loss): Water Flow Solutions $ 24.2 $ 31.3 Water Management Solutions 19.6 11.4 Corporate (9.8) (13.8) $ 34.0 $ 28.9 Depreciation and amortization: Water Flow Solutions $ 7.7 $ 7.4 Water Management Solutions 7.0 7.7 Corporate 0.1 0.1 $ 14.8 $ 15.2 Strategic reorganization and other (benefits) charges: Water Flow Solutions $ — $ — Water Management Solutions — 0.1 Corporate (3.7) 2.3 $ (3.7) $ 2.4 Capital expenditures: Water Flow Solutions $ 7.8 $ 9.4 Water Management Solutions 2.1 1.6 Corporate — — $ 9.9 $ 11.0 Water Flow Solutions disaggregated net revenue: Central $ 44.0 $ 40.5 Northeast 31.3 30.0 Southeast 33.4 37.3 West 49.2 38.1 United States 157.9 145.9 Canada 4.4 7.9 Other international locations 3.3 1.1 $ 165.6 $ 154.9 Water Management Solutions disaggregated net revenue: Central $ 41.5 $ 28.8 Northeast 31.2 24.3 Southeast 33.3 25.5 West 29.1 24.7 United States 135.1 103.3 Canada 7.3 7.6 Other international locations 6.8 6.5 $ 149.2 $ 117.4

Organization (Details)

Organization (Details) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($) business_segments	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Restructuring and other charges	$ (3.7)	$ 2.4
Pension costs (benefits) other then service	$ 0.9	$ (1)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%
Number of Reportable Segments | business_segments	2
Proceeds from Other Equity, Gross Amount	$ 4.8
Intercompany Loan related to NMTC	12.2
Investment Fund Contribution for NMTC	16.5
Sub-CDE loan from NMTC	16.2
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 0	$ 0

Organization Restructuring (Det

Organization Restructuring (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ (3.7)	$ 2.4

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Revenue from External Customer [Line Items]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers We recognize revenue when control of promised products or services is transferred to our customers, in amounts that reflect the consideration to which we expect to be entitled in exchange for those products or services. We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, the payment terms are identified, the contract has commercial substance and collectability of consideration is probable. We determine the appropriate revenue recognition for our contracts with customers by analyzing the type, terms and conditions of each contract or arrangement with a customer. Disaggregation of Revenue Refer to Note 8. for disaggregation of our revenues from contracts with customers by reportable segment and by geographical region, which we believe best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Geographical region represents the location of the customer. Contract Asset and Liability Balances Differences in the timing of revenue recognition, billing and cash collection result in customer receivables, advance payments and billings in excess of revenue recognized. Customer receivables include amounts billed and currently due from customers as well as unbilled amounts (i.e., contract assets). Amounts are billed in accordance with contractual terms and unbilled amounts arise when the timing of billing differs from the timing of revenue recognized. Advance payments and billings in excess of revenue are recognized and recorded as deferred revenue, the majority of which is classified as current based on the timing when we expect to recognize revenue. We include current deferred revenue within Other current liabilities in the accompanying consolidated balance sheets. Deferred revenue represents contract liabilities and is recorded when customers remit cash payments in advance of our satisfaction of performance obligations under contractual arrangements. Contract liabilities are reversed when the performance obligation is satisfied and revenue is recognized. The table below represents the balances of our customer receivables and deferred revenue. December 31, September 30, 2022 2022 (in millions) Billed receivables $ 203.5 $ 230.5 Unbilled receivables 4.5 3.1 Gross customer receivables 208.0 233.6 Allowance for credit losses (6.1) (5.6) Receivables, net $ 201.9 $ 228.0 Deferred revenue $ 8.4 $ 8.1 Performance Obligations A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. Our performance obligations are satisfied at a point in time for sales of equipment or over time for our software hosting and leak detection monitoring services. Performance obligations are supported by customer contracts, which provide frameworks for the nature of the distinct products or services. The transaction price is adjusted for our estimate of variable consideration which may include discounts and rebates. To estimate variable consideration, we apply the expected value or the most likely amount method, based on whichever method most appropriately predicts the amount of consideration we expect to receive. The method applied is typically based on historical experience and known trends. We constrain the amounts of variable consideration that are included in the transaction price, to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur or when uncertainties around the variable consideration are resolved. We exclude from the measurement of the transaction price all taxes assessed by a governmental authority. We have elected to use the practical expedient to not adjust the transaction price of a contract for the effects of a significant financing component if, at the inception of the contract, we expect that the period between when we transfer a product or service to a customer and when a customer remits payment will be one year or less. Revenue for the sale of our products is recognized when the obligations of the terms of our contract are satisfied, which is when the customer is able to direct the use of and obtain substantially all of the benefits from the product, which generally occurs upon shipment when control of the product transfers to the customer. We offer warranties to our customers which provide assurance that the products provided will function as intended and comply with any agreed-upon specifications. These warranties cannot be purchased separately from us. Costs to Obtain or Fulfill a Contract Shipping and handling costs associated with freight activities after the customer has obtained control of a product are included in cost of sales at the time the related revenue is recognized. We incur certain incremental costs to obtain a contract, which primarily relate to incremental sales commissions. Our sales commissions are paid based on a combination of orders and shipments, and we reserve the right to claw back any commissions in case of product returns, cancellations or lost collections. As the expected benefit associated with these incremental costs is generally one year or less based on the nature of the product sold and benefits received, we have applied a practical expedient and therefore do not capitalize the related costs and expense them as incurred.
Billed Contracts Receivable	$ 203.5	$ 230.5
Deferred Revenue	8.4	8.1
Unbilled receivables	4.5	3.1
Total customer receivables	208	233.6
Accounts Receivable, Allowance for Credit Loss, Current	6.1	5.6
Receivables, Net, Current	$ 201.9	$ 228

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 4.8		$ 4.7
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%
State income taxes, net of federal benefit	3.40%	3.90%
Tax benefits from stock compensation	0.70%	(1.00%)
Tax credits	(1.60%)	(1.20%)
Other	0.50%	0.50%

Income Taxes Income Tax Rate Re

Income Taxes Income Tax Rate Reconciliation (Details)	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21%	21%
Adjustments to reconcile to the effective tax rate:
State income taxes, net of federal benefit	3.40%	3.90%
Valuation allowance adjustment related to stock compensation	(0.20%)	1.40%
Tax benefits from stock compensation	0.70%	(1.00%)
Tax credits	(1.60%)	(1.20%)
Effective Income Tax Rate Reconciliation, GILTI, percent	0.80%	0.30%
Other	0.50%	0.50%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(1.60%)	(0.70%)

Borrowing Arrangements (Narrati

Borrowing Arrangements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Jun. 12, 2018
Outstanding letter of credit accrued fees and expenses	$ 0.2
Cash and cash equivalents			$ 207.3	$ 227.5
Future maturities of outstanding borrowings
Outstanding letters of credit	12.4
Domestic Line of Credit [Member]
Revolving credit facility amount	$ (175)
Line of Credit Facility, Interest Rate at Period End	200%
Future maturities of outstanding borrowings
Line of Credit Facility, Maximum Borrowing Capacity	$ 175
Potential increase size of the credit facility by an additional amount	150
Unsecured Debt [Member]
Long-term Debt, Gross					$ 450
Future maturities of outstanding borrowings
Payments of debt issuance costs		$ 5.5
Swing Line Loans [Member]
Revolving credit facility amount	(25)
Future maturities of outstanding borrowings
Line of Credit Facility, Maximum Borrowing Capacity	25
Letters Of Credit Outstanding [Member]
Revolving credit facility amount	(60)
Future maturities of outstanding borrowings
Line of Credit Facility, Maximum Borrowing Capacity	$ 60
5.5% Senior Notes
Debt Instrument, Interest Rate, Effective Percentage	4%
Future maturities of outstanding borrowings
Financial Liabilities Fair Value Disclosure	$ 395.8
Revolving Credit Facility
Future maturities of outstanding borrowings
Aggregate commitments availability	$ 17.5
Minimum [Member] | Domestic Line of Credit [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	37.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Long-term Debt [Member]
Debt Instrument, Basis Spread on Variable Rate	100%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Domestic Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	200%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Domestic Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	225%
Base Rate [Member] | Maximum [Member] | Domestic Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	125%

Borrowing Arrangements (Compone

Borrowing Arrangements (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Debt instrument	$ 451.4	$ 451.6
Deferred financing costs	(4.4)	(4.7)
Current portion of long-term debt	(0.9)	(0.8)
Long-term debt	446.1	446.1
Unsecured Debt [Member]
5.5% Senior Notes	450	450
Other [Member]
Debt instrument	$ 1.4	$ 1.6

Retirement Plans (Net Periodic

Retirement Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Service Cost	$ 0.2	$ 0.3
Defined Benefit Plan, Interest Cost	3.5	2.4
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(3.5)	(3.8)
Amortization of actuarial net loss	0.9	0.4
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost	0.9	(1)
Net periodic benefit cost	$ 1.1	$ (0.7)

Stock-based Compensation Plan_2

Stock-based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Nov. 30, 2021	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares
Share-based Payment Arrangement, Expense | $		$ 2.7	$ 2.6
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $		$ 15.8
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		1,274,371	277,344
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	4.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	4.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 9 months 18 days
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		131,670
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Option, Nonvested, Intrinsic Value | $ / shares		$ 10.76
Share-based compensation liability | $		$ 1.4
Granted, shares		267,093
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 11.41
Granted, shares		267,093
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		282,472
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		128,048
Granted, shares		228,692
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 11.39
Granted, shares		228,692
Market Based Performance Shares
Granted, shares		166,284
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 15.08
Granted, shares		166,284
Equity Option
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.89%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years
Granted, shares		573,279
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 3.31
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.89%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years
Granted, shares		573,279
Minimum [Member] | Performance Shares [Member]
Performance Factors		0
Minimum [Member] | Market Based Performance Shares
Performance Factors		0
Maximum [Member] | Performance Shares [Member]
Performance Factors		2
Maximum [Member] | Market Based Performance Shares
Performance Factors		2

Stock-based Compensation Plan_3

Stock-based Compensation Plans Grants Table (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Nov. 30, 2021	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	4.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		228,692
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 11.39
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 2.6
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		47,463
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 2.56
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 0.1
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		267,093
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 11.41
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 3
Market Based Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		166,284
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 15.08
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 2.5
Equity Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares		573,279
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 3.31
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 1.9
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.89%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years

Supplemental Balance Sheet In_4

Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 125.6	$ 146.5
Inventories:
Purchased components and raw material	200.2	181.8
Work in process	56	56.8
Finished goods	57.8	40.1
Inventories, net	314	278.7
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid Expense	18.1	14.6
Nontrade Receivables	2.3	1.6
Maintenance and repair tooling	3.2	2.8
Income taxes	0.8	0.8
Other Receivables	2.5	2.6
Other	3.5	4.4
Other	30.4	26.8
Property, plant and equipment:
Land	5.7	5.7
Buildings	86.5	87.6
Machinery and equipment	453.4	456
Construction in progress	110.1	104.7
Property, plant and equipment, gross	655.7	654
Accumulated depreciation	(352.8)	(352.4)
Property, plant and equipment net	302.9	301.6
Other Assets, Noncurrent [Abstract]
Operating lease, Right-of-Use asset	25.1	26
us-Maintenance, repair and tooling supplies	20.4	20.4
Nontrade Receivables, Noncurrent	3.6	3.6
Assets for Plan Benefits, Defined Benefit Plan	0.4	0.6
Notes Receivable, Related Parties, Noncurrent	1.8	1.7
Debt Issuance Costs, Noncurrent, Net	0.9	1
Other Assets, Miscellaneous, Noncurrent	4	3.4
Other noncurrent assets	56.2	56.7
Goodwill, Foreign Currency Translation Gain (Loss)	1.4
Goodwill	$ 100	$ 98.6

Schedule of Accrued Liabilities

Schedule of Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Other current liabilities:
Compensation and benefits	$ 27.1	$ 40.2
Customer rebates	21.3	16.2
Warranty	6.5	6.5
Deferred Revenue	8.4	8.1
Customer Refund Liability, Current	4.5	4.2
Accrual for Taxes Other than Income Taxes	3.6	4.4
Operating lease liability, current	4.7	4.4
Estimated Litigation Liability, Current	4.8	4.6
CARES Act deferral, current portion	0	4.4
Restructuring reserve, current	0.7	3.3
Environmental	0.7	0.7
Interest Payable	0.8	5.3
Accrued Income Taxes	15.1	7.5
Other Liabilities, Current	11	7.6
Accrued liabilities	109.2	117.4
Other Liabilities, Noncurrent [Abstract]
Operating lease liability, noncurrent	21.6	22.4
Standard Product Warranty Accrual, Noncurrent	3.4	4.2
Transition Tax Liability	4.1	4.1
Unrecognized Tax Benefits	4.8	4.7
New market tax credit liabilities	3.9	3.9
Workers' Compensation Liability, Noncurrent	6.5	6.5
Asset Retirement Obligation	3.6	3.6
Grant yet to be earned	2.5	2.5
Other Accrued Liabilities, Noncurrent	2.9	3.5
Other Liabilities, Noncurrent, Total	$ 53.3	$ 55.4

Intangible Assets, Goodwill a_2

Intangible Assets, Goodwill and Other (Details) $ in Millions	Sep. 30, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	$ (724.1)
Goodwill, Gross	$ 822.7

Segment Information (Narrative)

Segment Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Restructuring and other charges	$ (3.7)	$ 2.4
Operating income	34	28.9
Depreciation, Depletion and Amortization	14.8	15.2
Payments to Acquire Productive Assets	9.9	11
Net sales	314.8	272.3
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Restructuring and other charges	0	0
Operating income	24.2	31.3
Depreciation, Depletion and Amortization	7.7	7.4
Payments to Acquire Productive Assets	7.8	9.4
Net sales	165.6	154.9
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	44	40.5
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	31.3	30
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	33.4	37.3
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	49.2	38.1
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	157.9	145.9
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	4.4	7.9
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	3.3	1.1
Corporate
Segment Reporting Information [Line Items]
Restructuring and other charges	(3.7)	2.3
Operating income	(9.8)	(13.8)
Depreciation, Depletion and Amortization	0.1	0.1
Payments to Acquire Productive Assets	0	0
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Restructuring and other charges	0	(0.1)
Operating income	19.6	11.4
Depreciation, Depletion and Amortization	7	7.7
Payments to Acquire Productive Assets	2.1	1.6
Net sales	149.2	117.4
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	41.5	28.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	31.2	24.3
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	33.3	25.5
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	29.1	24.7
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	135.1	103.3
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	7.3	7.6
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	$ 6.8	$ 6.5

Segment Information (Schedule O

Segment Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 314.8	$ 272.3
Operating income	34	28.9
Depreciation and amortization	14.8	15.2
Restructuring and other charges	(3.7)	2.4
Payments to Acquire Productive Assets	9.9	11
Total assets	1,486.6		$ 1,498.1
Intangible intangible assets, net	355.6		$ 361.2
Mueller Co. [Member]
Segment Reporting Information [Line Items]
Net sales	165.6	154.9
Operating income	24.2	31.3
Depreciation and amortization	7.7	7.4
Restructuring and other charges	0	0
Payments to Acquire Productive Assets	7.8	9.4
Mueller Co. [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	44	40.5
Mueller Co. [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	31.3	30
Mueller Co. [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	33.4	37.3
Mueller Co. [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	49.2	38.1
Mueller Co. [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	4.4	7.9
Mueller Co. [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	3.3	1.1
Mueller Co. [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	157.9	145.9
Mueller Technologies [Member]
Segment Reporting Information [Line Items]
Net sales	149.2	117.4
Operating income	19.6	11.4
Depreciation and amortization	7	7.7
Restructuring and other charges	0	(0.1)
Payments to Acquire Productive Assets	2.1	1.6
Mueller Technologies [Member] | Central Region [Member]
Segment Reporting Information [Line Items]
Net sales	41.5	28.8
Mueller Technologies [Member] | Northeast Region [Member] [Member]
Segment Reporting Information [Line Items]
Net sales	31.2	24.3
Mueller Technologies [Member] | Southeast Region [Member]
Segment Reporting Information [Line Items]
Net sales	33.3	25.5
Mueller Technologies [Member] | Western Region [Member]
Segment Reporting Information [Line Items]
Net sales	29.1	24.7
Mueller Technologies [Member] | CANADA
Segment Reporting Information [Line Items]
Net sales	7.3	7.6
Mueller Technologies [Member] | Other International Locations [Member]
Segment Reporting Information [Line Items]
Net sales	6.8	6.5
Mueller Technologies [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Net sales	$ 135.1	$ 103.3

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	9 Months Ended
	Jun. 30, 2013 CAD ($)
Loss Contingency, Damages Sought, Value	$ 10

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares				3 Months Ended
	Feb. 22, 2023	Feb. 10, 2023	Jan. 27, 2023	Dec. 31, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Dividends declared per share, in dollars per share				$ 0.061	$ 0.058
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared			Jan. 25, 2023
Dividends declared per share, in dollars per share			$ 0.061
Dividends Payable, Date to be Paid	Feb. 21, 2023
Dividends Payable, Date of Record		Feb. 10, 2023

Uncategorized Items - mwa-20221

Label	Element	Value
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 4,600,000
Common Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	0
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	0
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	4,600,000
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 0