$MWA
Mueller Water Products, Inc. Stock $mwa

$mwa Overview Financials Valuation SEC Filings Company Website

2021 Q3 Form 10-K Financial Statement

#000135059321000061 Filed on November 19, 2021

Income Statement

Concept	2021 Q3	2021	2020 Q3
Revenue	$295.6M	$1.111B	$265.3M
YoY Change	11.42%	15.24%	-0.6%
Cost Of Revenue	$209.3M	$752.5M	$171.4M
YoY Change	22.11%	18.34%	-3.76%
Gross Profit	$86.30M	$358.5M	$93.90M
YoY Change	-8.09%	9.23%	5.74%
Gross Profit Margin	29.19%	32.27%	35.39%
Selling, General & Admin	$56.60M	$218.8M	$52.10M
YoY Change	8.64%	10.28%	7.42%
% of Gross Profit	65.59%	61.03%	55.48%
Research & Development		$17.10M
YoY Change		14.0%
% of Gross Profit		4.77%
Depreciation & Amortization	$15.00M	$59.60M	$15.00M
YoY Change	0.0%	3.11%	5.63%
% of Gross Profit	17.38%	16.62%	15.97%
Operating Expenses	$56.60M	$226.8M	$52.10M
YoY Change	8.64%	7.28%	7.42%
Operating Profit	$29.70M	$131.7M	$40.70M
YoY Change	-27.03%	12.76%	4.36%
Interest Expense	-$4.400M	$23.80M	-$6.000M
YoY Change	-26.67%	-10.53%	42.86%
% of Operating Profit	-14.81%	18.07%	-14.74%
Other Income/Expense, Net	$900.0K	$3.300M	$800.0K
YoY Change	12.5%	10.0%	100.0%
Pretax Income	$24.30M	$94.90M	$35.50M
YoY Change	-31.55%	0.85%	-31.2%
Income Tax	$5.900M	$24.50M	$8.800M
% Of Pretax Income	24.28%	25.82%	24.79%
Net Earnings	$18.40M	$70.40M	$26.70M
YoY Change	-31.09%	-2.22%	-33.58%
Net Earnings / Revenue	6.22%	6.34%	10.06%
Basic Earnings Per Share		$0.44	$0.17
Diluted Earnings Per Share	$115.1K	$442.2K	$0.17
COMMON SHARES
Basic Shares Outstanding	158.6M shares	158.4M shares	157.8M shares
Diluted Shares Outstanding		159.2M shares

Balance Sheet

Concept	2021 Q3	2021	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$227.5M	$227.5M	$208.9M
YoY Change	8.9%	8.9%	18.22%
Cash & Equivalents	$227.5M	$227.5M	$208.9M
Short-Term Investments
Other Short-Term Assets	$29.30M	$18.40M	$29.00M
YoY Change	1.03%	22.67%	11.54%
Inventory	$184.7M	$184.7M	$162.5M
Prepaid Expenses
Receivables	$212.2M	$212.2M	$180.8M
Other Receivables	$10.90M	$10.90M	$14.00M
Total Short-Term Assets	$653.7M	$653.7M	$581.2M
YoY Change	12.47%	12.47%	2.52%
LONG-TERM ASSETS
Property, Plant & Equipment	$283.4M	$310.5M	$253.8M
YoY Change	11.66%	11.13%	16.9%
Goodwill	$115.1M		$99.80M
YoY Change	15.33%		4.28%
Intangibles	$392.5M		$408.9M
YoY Change	-4.01%		-5.72%
Long-Term Investments
YoY Change
Other Assets	$73.30M	$44.40M	$51.30M
YoY Change	42.88%	85.77%	114.64%
Total Long-Term Assets	$864.3M	$864.3M	$813.8M
YoY Change	6.21%	6.21%	5.63%
TOTAL ASSETS
Total Short-Term Assets	$653.7M	$653.7M	$581.2M
Total Long-Term Assets	$864.3M	$864.3M	$813.8M
Total Assets	$1.518B	$1.518B	$1.395B
YoY Change	8.82%	8.82%	4.31%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$92.00M	$92.00M	$67.30M
YoY Change	36.7%	36.7%	-20.45%
Accrued Expenses	$127.1M	$61.80M	$86.60M
YoY Change	46.77%	21.41%	-6.88%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$1.000M	$1.000M	$1.100M
YoY Change	-9.09%	-9.09%	22.22%
Total Short-Term Liabilities	$220.1M	$220.1M	$155.0M
YoY Change	42.0%	42.0%	-13.17%
LONG-TERM LIABILITIES
Long-Term Debt	$445.9M	$445.9M	$446.5M
YoY Change	-0.13%	-0.13%	0.25%
Other Long-Term Liabilities	$62.00M	$62.00M	$56.30M
YoY Change	10.12%	10.12%	69.58%
Total Long-Term Liabilities	$507.9M	$507.9M	$502.8M
YoY Change	1.01%	1.01%	5.06%
TOTAL LIABILITIES
Total Short-Term Liabilities	$220.1M	$220.1M	$155.0M
Total Long-Term Liabilities	$507.9M	$507.9M	$502.8M
Total Liabilities	$823.1M	$823.1M	$754.3M
YoY Change	9.12%	9.12%	1.25%
SHAREHOLDERS EQUITY
Retained Earnings	-$643.9M		-$714.2M
YoY Change	-9.84%		-9.16%
Common Stock	$1.600M		$1.600M
YoY Change	0.0%		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$694.9M	$694.9M	$640.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.518B	$1.518B	$1.395B
YoY Change	8.82%	8.82%	4.31%

Cashflow Statement

Concept	2021 Q3	2021	2020 Q3
OPERATING ACTIVITIES
Net Income	$18.40M	$70.40M	$26.70M
YoY Change	-31.09%	-2.22%	-33.58%
Depreciation, Depletion And Amortization	$15.00M	$59.60M	$15.00M
YoY Change	0.0%	3.11%	5.63%
Cash From Operating Activities	$33.40M	$156.7M	$62.50M
YoY Change	-46.56%	11.69%	-16.33%
INVESTING ACTIVITIES
Capital Expenditures	-$16.60M	-$62.70M	-$16.50M
YoY Change	0.61%	-7.39%	-51.04%
Acquisitions		$19.70M
YoY Change
Other Investing Activities	$300.0K	-$19.00M	-$100.0K
YoY Change	-400.0%	-85.1%	-104.35%
Cash From Investing Activities	-$16.30M	-$81.70M	-$16.60M
YoY Change	-1.81%	21.04%	-47.13%
FINANCING ACTIVITIES
Cash Dividend Paid		$34.80M
YoY Change		5.14%
Common Stock Issuance & Retirement, Net		$8.100M
YoY Change		440.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-18.20M	-$58.80M	-8.800M
YoY Change	106.82%	42.03%	25.71%
NET CHANGE
Cash From Operating Activities	33.40M	$156.7M	62.50M
Cash From Investing Activities	-16.30M	-$81.70M	-16.60M
Cash From Financing Activities	-18.20M	-$58.80M	-8.800M
Net Change In Cash	-1.100M	$18.60M	37.10M
YoY Change	-102.96%	-42.24%	2.2%
FREE CASH FLOW
Cash From Operating Activities	$33.40M	$156.7M	$62.50M
Capital Expenditures	-$16.60M	-$62.70M	-$16.50M
Free Cash Flow	$50.00M	$219.4M	$79.00M
YoY Change	-36.71%	5.48%	-27.12%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001350593
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-32892
CY2021	dei	Entity Registrant Name EntityRegistrantName	MUELLER WATER PRODUCTS, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-3547095
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	1200 Abernathy Road N.E.
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 1200
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Atlanta
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	GA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	30328
CY2021	dei	City Area Code CityAreaCode	(770)
CY2021	dei	Local Phone Number LocalPhoneNumber	206-4200
CY2021	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01
CY2021	dei	Trading Symbol TradingSymbol	MWA
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5200000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	10000000.0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3200000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	592300000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	694900000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	70400000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	72000000.0	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Dividends In Excess Of Retained Earnings AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings	33100000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5300000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3500000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	5000000.0	USD
CY2021	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	4700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	11300000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	640700000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	70400000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	70400000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Dividends In Excess Of Retained Earnings AdjustmentsToAdditionalPaidInCapitalDividendsInExcessOfRetainedEarnings	34800000	USD
CY2021Q3	mwa	Cumulative Effect Of Accounting Change CumulativeEffectOfAccountingChange	100000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8100000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1900000	USD
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	10000000.0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19700000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	63800000	USD
CY2021	us-gaap	Depreciation Depreciation	31400000	USD
CY2020	us-gaap	Depreciation Depreciation	29600000	USD
CY2019	us-gaap	Depreciation Depreciation	26000000.0	USD
CY2021	us-gaap	Adjustment For Amortization AdjustmentForAmortization	28200000	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	28200000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	27000000.0	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16700000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	8100000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	5300000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4300000	USD
CY2021	us-gaap	Pension Expense Reversal Of Expense Noncash PensionExpenseReversalOfExpenseNoncash	-1900000	USD
CY2020	us-gaap	Pension Expense Reversal Of Expense Noncash PensionExpenseReversalOfExpenseNoncash	2800000	USD
CY2019	us-gaap	Pension Expense Reversal Of Expense Noncash PensionExpenseReversalOfExpenseNoncash	2000000.0	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5300000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7200000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1300000	USD
CY2021	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	3100000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	4300000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2400000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	0	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2500000	USD
CY2021	us-gaap	Other Noncash Expense OtherNoncashExpense	1300000	USD
CY2020	us-gaap	Other Noncash Expense OtherNoncashExpense	3700000	USD
CY2019	us-gaap	Other Noncash Expense OtherNoncashExpense	2400000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	29900000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	7500000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1400000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23500000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-24900000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	19800000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4900000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-900000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7400000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	23000000.0	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-17600000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-11000000.0	USD
CY2021	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	0	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-22000000.0	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	22000000.0	USD
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	37500000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	6600000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-6100000	USD
CY2021	us-gaap	Pension Contributions PensionContributions	0	USD
CY2020	us-gaap	Pension Contributions PensionContributions	0	USD
CY2019	us-gaap	Pension Contributions PensionContributions	700000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	2500000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	1900000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-9800000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	156700000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	140300000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	92500000	USD
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	62700000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	67700000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	86600000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	19700000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	127500000	USD
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	700000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	200000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2300000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-81700000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-67500000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-211800000	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	462400000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2021	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	450000000.0	USD
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	34800000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	33100000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	32000000.0	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	6000000.0	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1100000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2021	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	3900000	USD
CY2020	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	USD
CY2019	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	0	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	5200000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1000000.0	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	900000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1300000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1900000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3500000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	5200000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10000000.0	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5000000.0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10000000.0	USD
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	13200000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-400000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	400000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	400000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-58800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-41400000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-50900000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	2400000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	800000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-200000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	18600000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	32200000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-170400000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	208900000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	176700000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	347100000	USD
CY2021Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	227500000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	208900000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	176700000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	25300000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	24300000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	22200000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	16800000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	15300000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	29100000	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	business_segments
CY2014Q3	us-gaap	Variable Interest Entity Ownership Percentage VariableInterestEntityOwnershipPercentage	0.49
CY2020	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	1700000	USD
CY2021Q3	mwa	Proceeds From Other Equity Gross Amount ProceedsFromOtherEquityGrossAmount	4800000	USD
CY2021Q3	mwa	Intercompany Loan Related To Nmtc IntercompanyLoanRelatedToNMTC	12200000	USD
CY2021Q3	mwa	Investment Fund Contribution For Nmtc InvestmentFundContributionForNMTC	16500000	USD
CY2021Q3	mwa	Sub Cde Loan From Nmtc SubCDELoanFromNMTC	16200000	USD
CY2021	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	3900000	USD
CY2021	us-gaap	Proceeds From Other Equity ProceedsFromOtherEquity	3900000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2500000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1500000	USD
CY2018Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1400000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1100000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	300000	USD
CY2021	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	100000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	100000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	200000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3500000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2500000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1500000	USD
CY2020Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	11700000	USD
CY2019Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	7500000	USD
CY2018Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	5100000	USD
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	5900000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	4700000	USD
CY2019	us-gaap	Inventory Write Down InventoryWriteDown	3400000	USD
CY2021	mwa	Inventory Valuation Allowances And Reserves Deduction InventoryValuationAllowancesAndReservesDeduction	-3600000	USD
CY2020	mwa	Inventory Valuation Allowances And Reserves Deduction InventoryValuationAllowancesAndReservesDeduction	-700000	USD
CY2019	mwa	Inventory Valuation Allowances And Reserves Deduction InventoryValuationAllowancesAndReservesDeduction	-1200000	USD
CY2021	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	800000	USD
CY2020	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	200000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Adjustments ValuationAllowancesAndReservesAdjustments	200000	USD
CY2021Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	14800000	USD
CY2020Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	11700000	USD
CY2019Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	7500000	USD
CY2021Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3800000	USD
CY2021Q3	mwa	Exposure To Workers Compensation Claims Per Incident ExposureToWorkersCompensationClaimsPerIncident	800000	USD
CY2021Q3	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	10500000	USD
CY2020Q3	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	6200000	USD
CY2020Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	14400000	USD
CY2019Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	17100000	USD
CY2018Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	20000000.0	USD
CY2021	us-gaap	Product Warranty Expense ProductWarrantyExpense	3500000	USD
CY2020	us-gaap	Product Warranty Expense ProductWarrantyExpense	2600000	USD
CY2019	us-gaap	Product Warranty Expense ProductWarrantyExpense	3900000	USD
CY2021	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	8200000	USD
CY2020	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	5300000	USD
CY2019	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	6800000	USD
CY2021Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	9700000	USD
CY2020Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	14400000	USD
CY2019Q3	mwa	Warranty Liability Unclassified WarrantyLiabilityUnclassified	17100000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6600000	USD
CY2021	mwa	Income Tax Benefit Likelihood Of Realization Threshold IncomeTaxBenefitLikelihoodOfRealizationThreshold	0.50
CY2021Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	217000000.0	USD
CY2020Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	180300000	USD
CY2021Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	2300000	USD
CY2020Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	5300000	USD
CY2021Q3	us-gaap	Accounts Receivable Gross AccountsReceivableGross	219300000	USD
CY2020Q3	us-gaap	Accounts Receivable Gross AccountsReceivableGross	185600000	USD
CY2021Q3	us-gaap	Deferred Revenue DeferredRevenue	5400000	USD
CY2020Q3	us-gaap	Deferred Revenue DeferredRevenue	5600000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	6100000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	6300000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	5800000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1200000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1300000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1000000.0	USD
CY2021	mwa	Total Lease Expense TotalLeaseExpense	7300000	USD
CY2020	mwa	Total Lease Expense TotalLeaseExpense	7600000	USD
CY2019	mwa	Total Lease Expense TotalLeaseExpense	6800000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	6100000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	6100000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1200000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1300000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	27100000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	25600000	USD
CY2021Q3	mwa	Finance Lease Right Of Use Asset After Accumulated Amortization FinanceLeaseRightOfUseAssetAfterAccumulatedAmortization	2200000	USD
CY2020Q3	mwa	Finance Lease Right Of Use Asset After Accumulated Amortization FinanceLeaseRightOfUseAssetAfterAccumulatedAmortization	2500000	USD
CY2021Q3	mwa	Total Right Of Use Assets TotalRightOfUseAssets	29300000	USD
CY2020Q3	mwa	Total Right Of Use Assets TotalRightOfUseAssets	28100000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4000000.0	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4000000.0	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	24600000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	23300000	USD
CY2021Q3	mwa	Finance Lease Liability Current Portion FinanceLeaseLiabilityCurrentPortion	1000000.0	USD
CY2020Q3	mwa	Finance Lease Liability Current Portion FinanceLeaseLiabilityCurrentPortion	1100000	USD
CY2021Q3	mwa	Finance Lease Liability Non Current FinanceLeaseLiabilityNonCurrent	1200000	USD
CY2020Q3	mwa	Finance Lease Liability Non Current FinanceLeaseLiabilityNonCurrent	1400000	USD
CY2021Q3	mwa	Total Lease Liabilities TotalLeaseLiabilities	30800000	USD
CY2020Q3	mwa	Total Lease Liabilities TotalLeaseLiabilities	29800000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y9M25D
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y10M13D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y6M10D
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y6M7D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0536
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0564
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0424
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0496
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5400000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1100000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5000000.0	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	700000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4700000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	300000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4300000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	100000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4100000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	100000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11500000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35000000.0	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	2300000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6400000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	100000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	28600000	USD
CY2021Q3	mwa	Pv Of Finance Lease Liabilities PVOfFinanceLeaseLiabilities	2200000	USD
CY2020	us-gaap	Business Combination Consideration Transferred1 BusinessCombinationConsiderationTransferred1	140700000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	13200000	USD
CY2020Q4	us-gaap	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Property Plant And Equipment BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment	300000	USD
CY2020Q4	us-gaap	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Financial Assets BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets	300000	USD
CY2019	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	37200000	USD
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P12Y
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables	6900000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory	17000000.0	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Prepaid Expense And Other Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets	200000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment	8100000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets	1700000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Indefinite Lived Intangible Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets	4600000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet	80400000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable	5500000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Other BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther	2900000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities	11200000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities	1700000	USD
CY2019Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	140700000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	13200000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-127500000	USD
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables	500000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory	600000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets	900000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet	12100000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable	800000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities	1100000	USD
CY2021Q3	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	19700000	USD
CY2021Q3	mwa	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	770300000	USD
CY2020Q3	mwa	Intangible Assets Gross Including Goodwill IntangibleAssetsGrossIncludingGoodwill	760400000	USD
CY2021Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	392500000	USD
CY2020Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	408900000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	99800000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	95700000	USD
CY2021	us-gaap	Indefinite Lived Intangible Assets Foreign Currency Translation Gain Loss IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss	3200000	USD
CY2020	us-gaap	Indefinite Lived Intangible Assets Foreign Currency Translation Gain Loss IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss	3800000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	115100000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	99800000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	94000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	89700000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	78400000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	900000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4400000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	3700000	USD
CY2021	mwa	Net Income Before Income Taxand Discontinued Operations NetIncomeBeforeIncomeTaxandDiscontinuedOperations	94900000	USD
CY2020	mwa	Net Income Before Income Taxand Discontinued Operations NetIncomeBeforeIncomeTaxandDiscontinuedOperations	94100000	USD
CY2019	mwa	Net Income Before Income Taxand Discontinued Operations NetIncomeBeforeIncomeTaxandDiscontinuedOperations	82100000	USD
CY2021Q3	mwa	Transition Tax Liability TransitionTaxLiability	4700000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	4500000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	21900000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	10900000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	11600000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6300000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2700000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3900000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1600000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1300000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1500000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	29800000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	14900000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	17000000.0	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-4700000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	5600000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2500000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1300000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2000000.0	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-400000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	700000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-400000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-800000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5300000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7200000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1300000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18300000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19900000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19800000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17200000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3100000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3300000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3200000	USD
CY2021	mwa	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	-300000	USD
CY2020	mwa	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	-1000000.0	USD
CY2019	mwa	Effective Income Tax Rate Reconciliation Uncertain Tax Positions EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	1400000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	600000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	600000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	300000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	500000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	400000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	1300000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-400000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	100000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1300000	USD
CY2021	mwa	Effective Income Tax Rate Reconciliation Foreign Investment Basis Difference EffectiveIncomeTaxRateReconciliationForeignInvestmentBasisDifference	-1500000	USD
CY2020	mwa	Effective Income Tax Rate Reconciliation Foreign Investment Basis Difference EffectiveIncomeTaxRateReconciliationForeignInvestmentBasisDifference	-100000	USD
CY2019	mwa	Effective Income Tax Rate Reconciliation Foreign Investment Basis Difference EffectiveIncomeTaxRateReconciliationForeignInvestmentBasisDifference	1100000	USD
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1200000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	100000	USD
CY2021	mwa	Effective Income Tax Rate Reconciliation Federal Transition Tax Amount EffectiveIncomeTaxRateReconciliationFederalTransitionTaxAmount	0	USD
CY2020	mwa	Effective Income Tax Rate Reconciliation Federal Transition Tax Amount EffectiveIncomeTaxRateReconciliationFederalTransitionTaxAmount	0	USD
CY2019	mwa	Effective Income Tax Rate Reconciliation Federal Transition Tax Amount EffectiveIncomeTaxRateReconciliationFederalTransitionTaxAmount	-600000	USD
CY2021	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	200000	USD
CY2020	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	500000	USD
CY2019	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	300000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1600000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1800000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1800000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-900000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	100000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	12700000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24500000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22100000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18300000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4500000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3300000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1500000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	300000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	300000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4800000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4500000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	600000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	400000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	12200000	USD
CY2021Q3	mwa	Deferred Tax Assets Leasing Liabilities DeferredTaxAssetsLeasingLiabilities	8200000	USD
CY2020Q3	mwa	Deferred Tax Assets Leasing Liabilities DeferredTaxAssetsLeasingLiabilities	7300000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	6100000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	4600000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	2800000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	3000000.0	USD
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	14800000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	3000000.0	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3800000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2600000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	0	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	200000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2900000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1100000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	51300000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	34000000.0	USD
CY2021Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	13600000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2900000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	37700000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	31100000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	86300000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	90200000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	7600000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	6600000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	6800000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	5000000.0	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	3900000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Deferred Expense DeferredTaxLiabilitiesDeferredExpense	0	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	27400000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	25100000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	500000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	500000	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	132500000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	127400000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	94800000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	96300000	USD
CY2021Q3	us-gaap	Long Term Debt LongTermDebt	452200000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	452500000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	1000000.0	USD
CY2020Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	1100000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	445900000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	446500000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1000000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	700000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	300000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100000	USD
CY2021Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100000	USD
CY2021	us-gaap	Line Of Credit Facility Expiration Date1 LineOfCreditFacilityExpirationDate1	2025-07-29
CY2021Q3	mwa	Outstanding Letter Of Credit OutstandingLetterOfCredit	15000000	USD
CY2021Q3	mwa	Outstanding Letter Of Credit Accrued Fees And Expenses OutstandingLetterOfCreditAccruedFeesAndExpenses	1300000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16700000	USD
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	12400000	USD
CY2021	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	4300000	USD
CY2020	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	700000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0301
CY2020Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0284
CY2019Q3	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0326
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0284
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0326
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0437
CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0450
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0500
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0493
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	0	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	100000	USD
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1500000	USD
CY2020	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1500000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	1600000	USD
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	9900000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	11200000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	13900000	USD
CY2021	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	15700000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	16900000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	16200000	USD
CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-2500000	USD
CY2020	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-2800000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1900000	USD
CY2021	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-700000	USD
CY2021	us-gaap	Defined Benefit Plan Other Costs DefinedBenefitPlanOtherCosts	0	USD
CY2020	us-gaap	Defined Benefit Plan Other Costs DefinedBenefitPlanOtherCosts	-100000	USD
CY2019	us-gaap	Defined Benefit Plan Other Costs DefinedBenefitPlanOtherCosts	100000	USD
CY2021	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3300000	USD
CY2020	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	-3000000.0	USD
CY2019	us-gaap	Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent	400000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1800000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1500000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	2000000.0	USD
CY2021Q3	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2021Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2020Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2019Q3	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2021Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	353500000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	360400000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	24100000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	23900000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	23500000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	23100000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	22700000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	104700000	USD
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5900000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5300000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5500000	USD
CY2018Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	157332121	shares
CY2019	us-gaap	Restricted Stock Shares Issued Net Of Shares For Tax Withholdings RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings	200431	shares
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	726636	shares
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	167806	shares
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1074234	shares
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	157462140	shares
CY2020	us-gaap	Restricted Stock Shares Issued Net Of Shares For Tax Withholdings RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings	242112	shares
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	534291	shares
CY2020	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	182971	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod	61610	shares
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	418374	shares
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	158064750	shares
CY2021	us-gaap	Restricted Stock Shares Issued Net Of Shares For Tax Withholdings RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings	182024	shares
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	151399	shares
CY2021	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	146135	shares
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	651271	shares
CY2021Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	157955433	shares
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11000000.0	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7200000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5500000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	8000000.0	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5500000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	4300000	USD
CY2021	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Basic ShareBasedCompensationIncreaseDecreaseInEarningsPerShareBasic	0.05
CY2020	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Basic ShareBasedCompensationIncreaseDecreaseInEarningsPerShareBasic	0.03
CY2019	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Basic ShareBasedCompensationIncreaseDecreaseInEarningsPerShareBasic	0.03
CY2021	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Diluted ShareBasedCompensationIncreaseDecreaseInEarningsPerShareDiluted	0.05
CY2020	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Diluted ShareBasedCompensationIncreaseDecreaseInEarningsPerShareDiluted	0.03
CY2019	mwa	Share Based Compensation Increase Decrease In Earnings Per Share Diluted ShareBasedCompensationIncreaseDecreaseInEarningsPerShareDiluted	0.03
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	578005	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	267298	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	106896	shares
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	8600000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y4M24D
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	20500000	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	5806070	shares
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2021	mwa	Share Based Compensation Expected Forfeiture Rate ShareBasedCompensationExpectedForfeitureRate	0.02
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1589026	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	5.03
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y10M24D
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	10300000	USD
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	726636	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	5.20
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4400000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	862390	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	4.89
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	5500000	USD
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	534291	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	4.15
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3300000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	328099	shares
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.11
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y3M18D
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1400000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	431520	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	11.86
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	151399	shares
CY2021	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	4.09
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1700000	USD
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	8421	shares
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	599799	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	10.67
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y9M18D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2700000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	176700	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	7.83
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y2M12D
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	1300000	USD
CY2021Q3	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	599799	shares
CY2021Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	10.67
CY2021	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P7Y9M18D
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	176700	shares
CY2021Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	7.83
CY2021Q3	us-gaap	Inventory Raw Materials And Purchased Parts Net Of Reserves InventoryRawMaterialsAndPurchasedPartsNetOfReserves	100900000	USD
CY2020Q3	us-gaap	Inventory Raw Materials And Purchased Parts Net Of Reserves InventoryRawMaterialsAndPurchasedPartsNetOfReserves	87300000	USD
CY2021Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	41600000	USD
CY2020Q3	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	32400000	USD
CY2021Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	42200000	USD
CY2020Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	42800000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	184700000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	162500000	USD
CY2021Q3	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	12800000	USD
CY2020Q3	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	10900000	USD
CY2021Q3	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	10700000	USD
CY2020Q3	us-gaap	Nontrade Receivables Current NontradeReceivablesCurrent	6400000	USD
CY2021Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	200000	USD
CY2020Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5500000	USD
CY2021Q3	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	2900000	USD
CY2020Q3	us-gaap	Materials Supplies And Other MaterialsSuppliesAndOther	3700000	USD
CY2021Q3	us-gaap	Other Receivables OtherReceivables	800000	USD
CY2020Q3	us-gaap	Other Receivables OtherReceivables	0	USD
CY2021Q3	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	1900000	USD
CY2020Q3	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	2500000	USD
CY2021Q3	us-gaap	Other Assets Current OtherAssetsCurrent	29300000	USD
CY2020Q3	us-gaap	Other Assets Current OtherAssetsCurrent	29000000.0	USD
CY2021Q3	us-gaap	Land Land	6100000	USD
CY2020Q3	us-gaap	Land Land	6200000	USD
CY2021Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	84600000	USD
CY2020Q3	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	80400000	USD
CY2021Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	433300000	USD
CY2020Q3	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	406300000	USD
CY2021Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	83700000	USD
CY2020Q3	us-gaap	Construction In Progress Gross ConstructionInProgressGross	57400000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	607700000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	550300000	USD
CY2021Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	324300000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	296500000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	283400000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	253800000	USD
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	27100000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	25600000	USD
CY2021Q3	mwa	Maintenance Repair And Tooling Supplies MaintenanceRepairAndToolingSupplies	19300000	USD
CY2020Q3	mwa	Maintenance Repair And Tooling Supplies MaintenanceRepairAndToolingSupplies	17500000	USD
CY2021Q3	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	2700000	USD
CY2020Q3	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	2100000	USD
CY2021Q3	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	1800000	USD
CY2020Q3	us-gaap	Notes Receivable Related Parties Noncurrent NotesReceivableRelatedPartiesNoncurrent	1800000	USD
CY2021Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	16800000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	900000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	1300000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	1300000	USD
CY2021Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	4300000	USD
CY2020Q3	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	2100000	USD
CY2021Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4000000.0	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4000000.0	USD
CY2021Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	73300000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	51300000	USD
CY2021Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	44600000	USD
CY2020Q3	us-gaap	Accrued Employee Benefits Current AccruedEmployeeBenefitsCurrent	32800000	USD
CY2021Q3	mwa	Accrued Rebates AccruedRebates	19600000	USD
CY2020Q3	mwa	Accrued Rebates AccruedRebates	9600000	USD
CY2021Q3	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	6200000	USD
CY2020Q3	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	7300000	USD
CY2021Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	6700000	USD
CY2020Q3	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7200000	USD
CY2021Q3	us-gaap	Deferred Revenue DeferredRevenue	5400000	USD
CY2020Q3	us-gaap	Deferred Revenue DeferredRevenue	5600000	USD
CY2021Q3	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	6000000.0	USD
CY2020Q3	us-gaap	Customer Refund Liability Current CustomerRefundLiabilityCurrent	4300000	USD
CY2021Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	4400000	USD
CY2020Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	3900000	USD
CY2021Q3	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	3100000	USD
CY2020Q3	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	2800000	USD
CY2021Q3	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	1200000	USD
CY2020Q3	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	1200000	USD
CY2021Q3	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	8500000	USD
CY2020Q3	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	200000	USD
CY2021Q3	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	2600000	USD
CY2020Q3	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	2700000	USD
CY2021Q3	mwa	Cares Act Payroll Tax Liabilities Current CARESActPayrollTaxLiabilitiesCurrent	3600000	USD
CY2020Q3	mwa	Cares Act Payroll Tax Liabilities Current CARESActPayrollTaxLiabilitiesCurrent	0	USD
CY2021Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	11200000	USD
CY2020Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	5000000.0	USD
CY2021Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	127100000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	86600000	USD
CY2021Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	24600000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	23300000	USD
CY2021Q3	us-gaap	Standard Product Warranty Accrual Noncurrent StandardProductWarrantyAccrualNoncurrent	3000000.0	USD
CY2020Q3	us-gaap	Standard Product Warranty Accrual Noncurrent StandardProductWarrantyAccrualNoncurrent	7200000	USD
CY2021Q3	mwa	Transition Tax Liability TransitionTaxLiability	4700000	USD
CY2020Q3	mwa	Transition Tax Liability TransitionTaxLiability	5200000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4800000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4500000	USD
CY2021Q3	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	7900000	USD
CY2020Q3	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	3800000	USD
CY2021Q3	mwa	Nmtc Liability NMTCLiability	3900000	USD
CY2020Q3	mwa	Nmtc Liability NMTCLiability	0	USD
CY2021Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	3600000	USD
CY2020Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	3500000	USD
CY2021Q3	mwa	Cares Act Payroll Tax Liabilities Noncurrent CARESActPayrollTaxLiabilitiesNoncurrent	3600000	USD
CY2020Q3	mwa	Cares Act Payroll Tax Liabilities Noncurrent CARESActPayrollTaxLiabilitiesNoncurrent	3300000	USD
CY2021Q3	mwa	Grant Yet To Be Earned GrantYetToBeEarned	2500000	USD
CY2020Q3	mwa	Grant Yet To Be Earned GrantYetToBeEarned	2500000	USD
CY2021Q3	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	3400000	USD
CY2020Q3	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	3000000.0	USD
CY2021Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	62000000.0	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	56300000	USD
CY2021	us-gaap	Restructuring Costs RestructuringCosts	5600000	USD
CY2020	us-gaap	Restructuring Costs RestructuringCosts	2500000	USD
CY2021	us-gaap	Restructuring Costs RestructuringCosts	5600000	USD
CY2021	us-gaap	Severance Costs1 SeveranceCosts1	3200000	USD
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	2800000	USD
CY2019Q3	us-gaap	Restructuring Reserve RestructuringReserve	1700000	USD
CY2018Q3	us-gaap	Restructuring Reserve RestructuringReserve	900000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	5400000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	4800000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	6600000	USD
CY2021	us-gaap	Payments For Restructuring PaymentsForRestructuring	5100000	USD
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	3700000	USD
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	5800000	USD
CY2021Q3	us-gaap	Restructuring Reserve RestructuringReserve	3100000	USD
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	2800000	USD
CY2019Q3	us-gaap	Restructuring Reserve RestructuringReserve	1700000	USD
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	17100000	USD
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	15000000.0	USD
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	14300000	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	3200000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	3300000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	7100000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1100000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1200000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1200000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2300000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	300000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3000000.0	USD
CY2021	us-gaap	Interest Expense Other InterestExpenseOther	300000	USD
CY2020	us-gaap	Interest Expense Other InterestExpenseOther	300000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	200000	USD
CY2021	us-gaap	Interest Expense InterestExpense	23800000	USD
CY2020	us-gaap	Interest Expense InterestExpense	26600000	USD
CY2019	us-gaap	Interest Expense InterestExpense	23300000	USD
CY2021	us-gaap	Interest Income Other InterestIncomeOther	400000	USD
CY2020	us-gaap	Interest Income Other InterestIncomeOther	1100000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	3500000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-23400000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-25500000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-19800000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	8000000.0	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	32700000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-24700000	USD
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	9200000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	8600000	USD
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	17800000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	0	USD
CY2021	mwa	Other Comprehensive Income Loss Defined Benefit Plan Reclassifications OtherComprehensiveIncomeLossDefinedBenefitPlanReclassifications	1900000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1900000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	9200000	USD
CY2021	mwa	Other Comprehensive Income Loss Defined Benefit Plan After Reclassification OtherComprehensiveIncomeLossDefinedBenefitPlanAfterReclassification	10500000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	19700000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	17200000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	22200000	USD
CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5000000.0	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	business_segments
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	283400000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	253800000	USD
CY2021	us-gaap	Revenues Revenues	1111000000	USD
CY2020	us-gaap	Revenues Revenues	964100000	USD
CY2019	us-gaap	Revenues Revenues	968000000.0	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	131700000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	116800000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	124300000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	59600000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	57800000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	53000000.0	USD
CY2021	us-gaap	Other General Expense OtherGeneralExpense	8000000.0	USD
CY2020	us-gaap	Other General Expense OtherGeneralExpense	13000000.0	USD
CY2019	us-gaap	Other General Expense OtherGeneralExpense	16300000	USD
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	62700000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	67700000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	86600000	USD
CY2021Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	507600000	USD
CY2020Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	508700000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	184700000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	162500000	USD
CY2020	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	10000000	CAD
CY2021	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	22200000	USD

Files In Submission

Name	View Source	Status
R42.htm	Edgar Link	pending
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0001350593-21-000061-index.html	Edgar Link	pending
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exhibit1032formperformance.htm	Edgar Link	pending
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$MWA
Mueller Water Products, Inc. Stock $mwa

2021 Q3 Form 10-K Financial Statement

#000135059321000061 Filed on November 19, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MWA Mueller Water Products, Inc. Stock $mwa

2021 Q3 Form 10-K Financial Statement

#000135059321000061 Filed on November 19, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MWA
Mueller Water Products, Inc. Stock $mwa