$MLI
MUELLER INDUSTRIES INC Stock $mli

$mli Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000008943922000013 Filed on February 23, 2022

Income Statement

Concept	2021 Q4	2021 Q3	2021 Q2
Revenue	$956.4M	$982.2M	$1.013B
YoY Change	41.5%	58.66%	102.45%
Cost Of Revenue	$726.6M	$744.3M	$799.7M
YoY Change	31.27%	48.62%	98.36%
Gross Profit	$229.8M	$238.0M	$212.9M
YoY Change	87.8%	101.13%	119.44%
Gross Profit Margin	24.02%	24.23%	21.02%
Selling, General & Admin	$48.86M	$48.52M	$43.93M
YoY Change	9.06%	26.54%	30.69%
% of Gross Profit	21.27%	20.39%	20.64%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$11.46M	$10.87M	$11.13M
YoY Change	-2.07%	1.08%	0.33%
% of Gross Profit	4.99%	4.57%	5.23%
Operating Expenses	$60.49M	$48.52M	$43.93M
YoY Change	6.69%	26.54%	30.69%
Operating Profit	$169.3M	$233.4M	$157.8M
YoY Change	157.86%	237.08%	201.77%
Interest Expense	-$258.0K	$1.116M	$1.866M
YoY Change	-93.55%	-77.15%	-62.48%
% of Operating Profit	-0.15%	0.48%	1.18%
Other Income/Expense, Net	-$35.00K	-$2.548M	$683.0K
YoY Change	-98.91%	-588.12%	-75.9%
Pretax Income	$171.8M	$229.7M	$151.0M
YoY Change	329.62%	254.1%	200.97%
Income Tax	$44.86M	$60.23M	$39.01M
% Of Pretax Income	26.11%	26.22%	25.84%
Net Earnings	$125.6M	$171.0M	$108.8M
YoY Change	244.87%	300.4%	289.3%
Net Earnings / Revenue	13.13%	17.41%	10.75%
Basic Earnings Per Share	$2.24	$3.05	$1.95
Diluted Earnings Per Share	$2.21	$3.01	$1.92
COMMON SHARES
Basic Shares Outstanding	57.37M shares	56.08M shares	55.95M shares
Diluted Shares Outstanding		56.81M shares	56.81M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2021 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$87.92M	$104.8M	$110.7M
YoY Change	-26.18%	-7.76%	-10.45%
Cash & Equivalents	$87.92M	$104.8M	$110.7M
Short-Term Investments
Other Short-Term Assets	$28.98M	$33.60M	$44.29M
YoY Change	-14.15%	35.06%	52.94%
Inventory	$430.2M	$405.6M	$385.0M
Prepaid Expenses
Receivables	$471.9M	$494.0M	$542.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.019B	$1.038B	$1.082B
YoY Change	23.46%	42.21%	61.33%
LONG-TERM ASSETS
Property, Plant & Equipment	$385.6M	$370.2M	$385.2M
YoY Change	2.39%	0.4%	6.19%
Goodwill	$171.3M	$160.0M	$169.4M
YoY Change	2.13%	-13.74%	10.45%
Intangibles	$61.71M	$63.58M	$76.89M
YoY Change	-20.07%	1.77%	22.03%
Long-Term Investments	$61.13M	$65.00M	$36.90M
YoY Change	60.88%	137.23%	13.89%
Other Assets	$6.684M	$7.658M	$12.18M
YoY Change	-53.54%	-67.6%	-49.18%
Total Long-Term Assets	$709.9M	$690.6M	$707.4M
YoY Change	0.96%	0.06%	8.39%
TOTAL ASSETS
Total Short-Term Assets	$1.019B	$1.038B	$1.082B
Total Long-Term Assets	$709.9M	$690.6M	$707.4M
Total Assets	$1.729B	$1.729B	$1.789B
YoY Change	13.11%	21.73%	35.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$180.8M	$180.5M	$190.4M
YoY Change	22.37%	67.04%	103.47%
Accrued Expenses	$55.64M	$56.13M	$46.05M
YoY Change	5.79%	1.49%	2.33%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$811.0K	$1.110M	$6.428M
YoY Change	-98.04%	-83.39%	-1.76%
Total Short-Term Liabilities	$382.4M	$380.1M	$362.4M
YoY Change	12.6%	50.38%	58.08%
LONG-TERM LIABILITIES
Long-Term Debt	$1.064M	$121.0M	$351.0M
YoY Change	-99.63%	-64.72%	8.63%
Other Long-Term Liabilities	$21.81M	$25.37M	$20.11M
YoY Change	48.08%	104.39%	93.58%
Total Long-Term Liabilities	$22.88M	$146.4M	$371.1M
YoY Change	-92.41%	-58.81%	11.28%
TOTAL LIABILITIES
Total Short-Term Liabilities	$382.4M	$380.1M	$362.4M
Total Long-Term Liabilities	$22.88M	$146.4M	$371.1M
Total Liabilities	$472.0M	$602.3M	$815.5M
YoY Change	-35.12%	-11.51%	28.8%
SHAREHOLDERS EQUITY
Retained Earnings	$1.458B	$1.340B	$1.177B
YoY Change	43.03%	35.53%	23.62%
Common Stock	$802.0K	$802.0K	$802.0K
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$470.0M	$464.7M	$468.8M
YoY Change	0.24%	-0.86%	-1.14%
Treasury Stock Shares	6.500M shares
Shareholders Equity	$1.222B	$1.108B	$945.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.729B	$1.729B	$1.789B
YoY Change	13.11%	21.73%	35.22%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021 Q2
OPERATING ACTIVITIES
Net Income	$125.6M	$171.0M	$108.8M
YoY Change	244.87%	300.4%	289.3%
Depreciation, Depletion And Amortization	$11.46M	$10.87M	$11.13M
YoY Change	-2.07%	1.08%	0.33%
Cash From Operating Activities	$130.2M	$172.2M	$31.88M
YoY Change	170.17%	218.3%	-72.21%
INVESTING ACTIVITIES
Capital Expenditures	-$6.286M	-$7.569M	-$8.778M
YoY Change	-57.24%	8.13%	72.12%
Acquisitions
YoY Change
Other Investing Activities	-$8.459M	$73.03M	$8.634M
YoY Change	-8559.0%	-209.99%
Cash From Investing Activities	-$14.74M	$65.46M	-$144.0K
YoY Change	0.99%	-189.19%	-97.18%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-132.6M	-253.9M	-55.28M
YoY Change	409.9%	-4194.68%	-64.79%
NET CHANGE
Cash From Operating Activities	130.2M	172.2M	31.88M
Cash From Investing Activities	-14.74M	65.46M	-144.0K
Cash From Financing Activities	-132.6M	-253.9M	-55.28M
Net Change In Cash	-17.10M	-16.21M	-23.54M
YoY Change	-325.0%	23.72%	-50.34%
FREE CASH FLOW
Cash From Operating Activities	$130.2M	$172.2M	$31.88M
Capital Expenditures	-$6.286M	-$7.569M	-$8.778M
Free Cash Flow	$136.5M	$179.8M	$40.66M
YoY Change	117.02%	194.22%	-66.06%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000089439
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 Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-25
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-25
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-6770
CY2021	dei	Entity Registrant Name EntityRegistrantName	MUELLER INDUSTRIES, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	25-0790410
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	150 Schilling Boulevard
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	162358000	USD
CY2021	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2021	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Collierville
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	38017
CY2021	dei	City Area Code CityAreaCode	901
CY2021	dei	Local Phone Number LocalPhoneNumber	753-3200
CY2021	dei	Security12b Title Security12bTitle	Common Stock, $0.01 Par Value
CY2021	dei	Trading Symbol TradingSymbol	MLI
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	2461602567	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	57301881	shares
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3769345000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2398043000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2021	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2938989000	USD
CY2020	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1966161000	USD
CY2019	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2035610000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45390000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	44843000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42693000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	184052000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	159483000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2020	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	22053000	USD
CY2019	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	57760000	USD
CY2021	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	963000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2829000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3771000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2020	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2019	us-gaap	Insurance Recoveries InsuranceRecoveries	485000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	655845000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	245838000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	191403000	USD
CY2021	us-gaap	Interest Expense InterestExpense	7709000	USD
CY2020	us-gaap	Interest Expense InterestExpense	19247000	USD
CY2019	us-gaap	Interest Expense InterestExpense	25683000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5674000	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	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	5053000	USD
CY2020	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	4454000	USD
CY2019	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	1321000	USD
CY2021	mli	Defined Benefit Plans Termination Expenses DefinedBenefitPlansTerminationExpenses	0	USD
CY2020	mli	Defined Benefit Plans Termination Expenses DefinedBenefitPlansTerminationExpenses	17835000	USD
CY2019	mli	Defined Benefit Plans Termination Expenses DefinedBenefitPlansTerminationExpenses	0	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3730000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4887000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1684000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	641139000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	209189000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	166083000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	165858000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	55321000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35257000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-157000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-10219000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-24594000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	475124000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	143649000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6604000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4156000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5260000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	468520000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	139493000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	100972000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	56011000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55821000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55798000	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	787000	shares
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	569000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	545000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56798000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56390000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56343000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	8.36
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.50
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.81
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	8.25
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.47
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.79
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.52
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2021	us-gaap	Profit Loss ProfitLoss	475124000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	143649000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-6730000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	10350000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7409000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	-47000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	146000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	195000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	-181000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	508000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	690000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1379000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1560000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-671000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-5703000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-4652000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3112000	USD
CY2021	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	284000	USD
CY2020	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	-38000	USD
CY2019	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	-244000	USD
CY2021	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	978000	USD
CY2020	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-132000	USD
CY2019	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-839000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-230000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15378000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10372000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	474894000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	159027000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	116604000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4838000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5647000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4610000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	470056000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	153380000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	111994000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	87924000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	119075000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2590000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1538000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	471859000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	357532000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	430244000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	315002000	USD
CY2021Q4	us-gaap	Other Assets Current OtherAssetsCurrent	28976000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	33752000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	1019003000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	825361000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	385562000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	376572000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23510000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29301000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	171330000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	167764000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	61714000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	77207000	USD
CY2021Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	61133000	USD
CY2020Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	37976000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6684000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	14387000	USD
CY2021Q4	us-gaap	Assets Assets	1728936000	USD
CY2020Q4	us-gaap	Assets Assets	1528568000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	811000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	41283000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	180793000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	147741000	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	49629000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	46299000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6015000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6259000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	145191000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	98061000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	382439000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	339643000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1064000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	286593000	USD
CY2021Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	5572000	USD
CY2020Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	13552000	USD
CY2021Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	11961000	USD
CY2020Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	13289000	USD
CY2021Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	17678000	USD
CY2020Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	21256000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	14347000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	16842000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	17099000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21602000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	21813000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	14731000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	471973000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	727508000	USD
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1.00
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	80183004	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	80183004	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	57295961	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	57087432	shares
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	802000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	802000	USD
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	286208000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	280051000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1458489000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1019694000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-53347000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-54883000	USD
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	470034000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	468919000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	1222118000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	776745000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	34845000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	24315000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1256963000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	801060000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1728936000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1528568000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	475124000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	143649000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2021	us-gaap	Depreciation Depreciation	39120000	USD
CY2020	us-gaap	Depreciation Depreciation	38715000	USD
CY2019	us-gaap	Depreciation Depreciation	37337000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6270000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6128000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5356000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	265000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	319000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	318000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-157000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-10219000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-24594000	USD
CY2021	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	0	USD
CY2020	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	0	USD
CY2019	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	485000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5674000	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	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	0	USD
CY2020	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	0	USD
CY2019	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	3625000	USD
CY2021	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2020	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2019	us-gaap	Insurance Recoveries InsuranceRecoveries	485000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	9822000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	8570000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	8744000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1216000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1208000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-80000	USD
CY2021	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	-11642000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	769000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-132000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	963000	USD
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	57760000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2829000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3771000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7413000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4046000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-428000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	124708000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	76404000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6585000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	119514000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-5207000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-39561000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-919000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20609000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	15639000	USD
CY2021	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	73755000	USD
CY2020	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	74097000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-7076000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-5467000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-1142000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-7944000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2645000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2399000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-322000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	311701000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	245073000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	200544000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2302000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	181000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3240000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	30206000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	72648000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-3465000	USD
CY2021	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	81884000	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	31833000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	43885000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	31162000	USD
CY2021	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	8539000	USD
CY2020	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	9270000	USD
CY2019	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	0	USD
CY2021	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1613000	USD
CY2020	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	0	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	16000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	29073000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-125622000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-40457000	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	29137000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22341000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22325000	USD
CY2021	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	9722000	USD
CY2020	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	0	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	846000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	595000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	190038000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	100658000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	920610000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	246898000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	206718000	USD
CY2021	mli	Proceeds From Issuance Repayments Of Debt By Consolidated Joint Ventures ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures	-5113000	USD
CY2020	mli	Proceeds From Issuance Repayments Of Debt By Consolidated Joint Ventures ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures	-259000	USD
CY2019	mli	Proceeds From Issuance Repayments Of Debt By Consolidated Joint Ventures ProceedsFromIssuanceRepaymentsOfDebtByConsolidatedJointVentures	-4305000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4864000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5574000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1763000	USD
CY2021	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	1250000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	7000000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	3170000	USD
CY2021	mli	Payments For Settlement Of Stock Based Awards PaymentsForSettlementOfStockBasedAwards	-85000	USD
CY2020	mli	Payments For Settlement Of Stock Based Awards PaymentsForSettlementOfStockBasedAwards	230000	USD
CY2019	mli	Payments For Settlement Of Stock Based Awards PaymentsForSettlementOfStockBasedAwards	1225000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1111000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-376722000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-92264000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-139694000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1052000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2147000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	511000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-37000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	29334000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	20904000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127376000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	98042000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	77138000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	90376000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127376000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	98042000	USD
CY2021	us-gaap	Fiscal Period FiscalPeriod	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Fiscal Years</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s fiscal year consists of 52 weeks ending on the last Saturday of December. These dates were December 25, 2021, December 26, 2020, and December 28, 2019.</span></div>
CY2021Q4	mli	Temporary Investments TemporaryInvestments	1400000	USD
CY2020Q4	mli	Temporary Investments TemporaryInvestments	13300000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2600000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1500000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2021	mli	Specified Percentage Over Which Unrecognized Gains And Losses Are Amortized SpecifiedPercentageOverWhichUnrecognizedGainsAndLossesAreAmortized	0.10
CY2021	mli	Average Remaining Service Period For The Pension Plans AverageRemainingServicePeriodForThePensionPlans	P11Y6M
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	10000	shares
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Concentrations of Credit and Market Risk</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Concentrations of credit risk with respect to accounts receivable are limited due to the large number of customers comprising the Company’s customer base, and their dispersion across different geographic areas and different industries, including HVAC, plumbing, refrigeration, hardware, automotive, OEMs, and others.</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company minimizes its exposure to base metal price fluctuations through various strategies. Generally, it prices an equivalent amount of copper raw material, under flexible pricing arrangements it maintains with its suppliers, at the time it determines the selling price of finished products to its customers.</span></div>
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-600000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-500000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	200000	USD
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of and Changes in Estimates</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with generally accepted accounting principles in the United States (U.S. GAAP) requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. </span><span style="color:#252525;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Management makes its best estimate of the ultimate outcome for these items based on historical trends and other information available when the financial statements are prepared. Changes in estimates are recognized in accordance with the accounting rules for the estimate, which is typically in the period when new information becomes available to management. Areas where the nature of the estimate makes it reasonably possible that actual results could materially differ from amounts estimated include but are not limited to: pension and other postretirement benefit plan obligations, tax liabilities, loss contingencies, litigation claims, environmental reserves, and impairment assessments of long-lived assets (including goodwill).</span></div>
CY2021	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	2800000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3769345000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2398043000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3769345000	USD
CY2021	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2938989000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45390000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	184052000	USD
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	57760000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2829000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	655845000	USD
CY2021	us-gaap	Interest Expense InterestExpense	7709000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5674000	USD
CY2021	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	5053000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3730000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	641139000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2398043000	USD
CY2020	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1966161000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	44843000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	159483000	USD
CY2020	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	22053000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3771000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	245838000	USD
CY2020	us-gaap	Interest Expense InterestExpense	19247000	USD
CY2020	mli	Defined Benefit Plans Termination Expenses DefinedBenefitPlansTerminationExpenses	17835000	USD
CY2020	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	4454000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4887000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	209189000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2019	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2035610000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42693000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	162358000	USD
CY2019	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	963000	USD
CY2019	us-gaap	Insurance Recoveries InsuranceRecoveries	485000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	191403000	USD
CY2019	us-gaap	Interest Expense InterestExpense	25683000	USD
CY2019	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	1321000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1684000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	166083000	USD
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3769345000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2398043000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2021Q4	us-gaap	Noncurrent Assets NoncurrentAssets	385562000	USD
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	376572000	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	363128000	USD
CY2021	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	65122000	USD
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	51146000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	31162000	USD
CY2021Q4	us-gaap	Assets Assets	1728936000	USD
CY2020Q4	us-gaap	Assets Assets	1528568000	USD
CY2019Q4	us-gaap	Assets Assets	1370940000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	87924000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	119075000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2349000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	8198000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	103000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	103000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	90376000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127376000	USD
CY2021Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	130133000	USD
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	85927000	USD
CY2021Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	64989000	USD
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	49361000	USD
CY2020Q4	mli	Accrued Discounts And Allowances Liability Current AccruedDiscountsAndAllowancesLiabilityCurrent	56000000	USD
CY2021Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	35700000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	6300000	USD
CY2020Q4	us-gaap	Sales And Excise Tax Payable Current SalesAndExciseTaxPayableCurrent	6400000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	6300000	USD
CY2021	mli	Environmental Expense Non Operating Properties EnvironmentalExpenseNonOperatingProperties	9700000	USD
CY2020	mli	Environmental Expense Non Operating Properties EnvironmentalExpenseNonOperatingProperties	2700000	USD
CY2021Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	500000	USD
CY2021Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	245226000	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	186785000	USD
CY2021Q4	us-gaap	Inventory Adjustments InventoryAdjustments	10104000	USD
CY2020Q4	us-gaap	Inventory Adjustments InventoryAdjustments	7071000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	430244000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	315002000	USD
CY2021Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	18500000	USD
CY2020Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	17300000	USD
CY2021Q4	us-gaap	Fifo Inventory Amount FIFOInventoryAmount	140400000	USD
CY2020Q4	us-gaap	Fifo Inventory Amount FIFOInventoryAmount	108100000	USD
CY2021Q4	mli	Fifo Value Of Inventory Consigned To Others FIFOValueOfInventoryConsignedToOthers	11000000	USD
CY2020Q4	mli	Fifo Value Of Inventory Consigned To Others FIFOValueOfInventoryConsignedToOthers	6400000	USD
CY2021Q4	mli	Accrued Discounts And Allowances Liability Current AccruedDiscountsAndAllowancesLiabilityCurrent	82200000	USD
CY2020Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	5400000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1903000	USD
CY2020	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-3013000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-465000	USD
CY2021	us-gaap	Interest Income Other InterestIncomeOther	353000	USD
CY2020	us-gaap	Interest Income Other InterestIncomeOther	1101000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	722000	USD
CY2021	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1474000	USD
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	773000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	497000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3730000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4887000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1684000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6259000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	17099000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	21602000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	23114000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27861000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0367
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0391
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y6M3D
CY2021Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	2000000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	7600000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	23510000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29301000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6015000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y11M26D
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	8365000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	7039000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4607000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4734000	USD
CY2021	us-gaap	Lease Cost LeaseCost	12972000	USD
CY2020	us-gaap	Lease Cost LeaseCost	11773000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	7869000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	7040000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6760000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4579000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3402000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2518000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2312000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	4898000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	24469000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1355000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	23114000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6015000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	17099000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	964067000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	939165000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	578505000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	562593000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	385562000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	376572000	USD
CY2021	us-gaap	Depreciation Depreciation	39100000	USD
CY2020	us-gaap	Depreciation Depreciation	38700000	USD
CY2019	us-gaap	Depreciation Depreciation	37300000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	202681000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	49405000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	153276000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	13674000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	814000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	167764000	USD
CY2021	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12098000	USD
CY2021	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	-6366000	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	2087000	USD
CY2021	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-79000	USD
CY2021Q4	us-gaap	Goodwill Gross GoodwillGross	222822000	USD
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	51492000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	171330000	USD
CY2019	mli	Goodwill Impairment Loss Excluding Turbotec GoodwillImpairmentLossExcludingTurbotec	0	USD
CY2021	mli	Goodwill Impairment Loss Excluding Turbotec GoodwillImpairmentLossExcludingTurbotec	0	USD
CY2020	mli	Goodwill Impairment Loss Excluding Turbotec GoodwillImpairmentLossExcludingTurbotec	0	USD
CY2021Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	2100000	USD
CY2021	us-gaap	Adjustment For Amortization AdjustmentForAmortization	6300000	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	6100000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	5400000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5607000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5295000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5069000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4943000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4789000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	36011000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	61714000	USD
CY2021Q4	mli	Long Term Debt Including Unamortized Discount Premium And Debt Issuance Costs LongTermDebtIncludingUnamortizedDiscountPremiumAndDebtIssuanceCosts	2940000	USD
CY2020Q4	mli	Long Term Debt Including Unamortized Discount Premium And Debt Issuance Costs LongTermDebtIncludingUnamortizedDiscountPremiumAndDebtIssuanceCosts	328095000	USD
CY2021Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	1065000	USD
CY2020Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	219000	USD
CY2021Q4	us-gaap	Debt Current DebtCurrent	811000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	41283000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1064000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	286593000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	811000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	222000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	222000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	185000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1500000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	2940000	USD
CY2021	us-gaap	Interest Expense Debt InterestExpenseDebt	8096000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	19510000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	25957000	USD
CY2021	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	387000	USD
CY2020	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	263000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	274000	USD
CY2021	us-gaap	Interest Expense InterestExpense	7709000	USD
CY2020	us-gaap	Interest Expense InterestExpense	19247000	USD
CY2019	us-gaap	Interest Expense InterestExpense	25683000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	13900000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	19800000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	25400000	USD
CY2020	mli	Defined Benefit Plan Plan Termination Incremental Benefit Payments DefinedBenefitPlanPlanTerminationIncrementalBenefitPayments	100000000	USD
CY2020	mli	Defined Benefit Plan Plan Assets Surplus Assets DefinedBenefitPlanPlanAssetsSurplusAssets	12400000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-800000	USD
CY2021	mli	Payable Maximum Period To Be Considered Current PayableMaximumPeriodToBeConsideredCurrent	P12M
CY2021Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.041
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	79478000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	78480000	USD
CY2021Q4	mli	Approximate Percentage Of Mutual Funds Actively Managed ApproximatePercentageOfMutualFundsActivelyManaged	0.78
CY2021Q4	mli	Approximate Percentage Of Mutual Funds Indexed Funds ApproximatePercentageOfMutualFundsIndexedFunds	0.22
CY2021Q4	mli	Percentage Of Mutual Funds Assets Invested In Us Equities PercentageOfMutualFundsAssetsInvestedInUSEquities	0.27
CY2021Q4	mli	Percent Of Mutual Funds Assets Invested In Non Us Equities PercentOfMutualFundsAssetsInvestedInNonUSEquities	0.73
CY2020Q4	mli	Approximate Percentage Of Mutual Funds Actively Managed ApproximatePercentageOfMutualFundsActivelyManaged	0.76
CY2020	mli	Coal Industry Retiree Health Benefit Act Of1992 Plan Contributions CoalIndustryRetireeHealthBenefitActOf1992PlanContributions	57000	USD
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CY2019	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	1700000	USD
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CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Third Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear	800000	USD
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Fourth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear	900000	USD
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Fifth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear	700000	USD
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due After Fifth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear	12300000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	518080000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	12727000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	53271000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	641139000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	112812000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	123059000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	64419000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	209189000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	166083000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	107804000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	37964000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	19066000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	34455000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	16221000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	16186000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5182000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3892000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	158445000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	59367000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35685000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3504000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-5991000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1725000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	2572000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	90000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-2311000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8345000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1855000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	158000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7413000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4046000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-428000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	165858000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	55321000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35257000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	134639000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	43930000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	34892000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21132000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5949000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3234000	USD
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	11185000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	2783000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-882000	USD
CY2021	mli	Income Tax Rate Reconciliation Investment In Unconsolidated Affiliates IncomeTaxRateReconciliationInvestmentInUnconsolidatedAffiliates	679000	USD
CY2020	mli	Income Tax Rate Reconciliation Investment In Unconsolidated Affiliates IncomeTaxRateReconciliationInvestmentInUnconsolidatedAffiliates	387000	USD
CY2019	mli	Income Tax Rate Reconciliation Investment In Unconsolidated Affiliates IncomeTaxRateReconciliationInvestmentInUnconsolidatedAffiliates	-538000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-419000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3046000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2525000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	165858000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	55321000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35257000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	15153000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	13910000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	8382000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	11477000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	9962000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	7782000	USD
CY2021Q4	mli	Deferred Tax Asset Tax Credit Federal And Foreign DeferredTaxAssetTaxCreditFederalAndForeign	6410000	USD
CY2020Q4	mli	Deferred Tax Asset Tax Credit Federal And Foreign DeferredTaxAssetTaxCreditFederalAndForeign	6250000	USD
CY2021Q4	mli	Deferred Tax Asset Tax Credit State And Local DeferredTaxAssetTaxCreditStateAndLocal	12043000	USD
CY2020Q4	mli	Deferred Tax Asset Tax Credit State And Local DeferredTaxAssetTaxCreditStateAndLocal	21178000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3608000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3751000	USD
CY2021Q4	mli	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	4988000	USD
CY2020Q4	mli	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	6034000	USD
CY2021Q4	mli	Deferred Tax Assets Tax Deferred Expense Basis Difference In Unconsolidated Affiliates DeferredTaxAssetsTaxDeferredExpenseBasisDifferenceInUnconsolidatedAffiliates	7690000	USD
CY2020Q4	mli	Deferred Tax Assets Tax Deferred Expense Basis Difference In Unconsolidated Affiliates DeferredTaxAssetsTaxDeferredExpenseBasisDifferenceInUnconsolidatedAffiliates	8478000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	68236000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	78860000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	26624000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	27199000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	41612000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	51661000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	45804000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	48990000	USD
CY2021Q4	mli	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	5099000	USD
CY2020Q4	mli	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	6157000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1765000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	638000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	52668000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	55785000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	11056000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4124000	USD
CY2021Q4	mli	State Income Tax Credit Carryforwards With Expiration StateIncomeTaxCreditCarryforwardsWithExpiration	1700000	USD
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	10400000	USD
CY2021Q4	mli	Federal And Foreign Tax Attributes With Potential Tax Benefits Unlimited Life FederalAndForeignTaxAttributesWithPotentialTaxBenefitsUnlimitedLife	4600000	USD
CY2021Q4	mli	Federal And Foreign Tax Attributes With Potential Tax Benefits FederalAndForeignTaxAttributesWithPotentialTaxBenefits	1800000	USD
CY2021Q4	mli	Federal And Foreign Tax Attributes With Potential Tax Benefits Valuation Allowance FederalAndForeignTaxAttributesWithPotentialTaxBenefitsValuationAllowance	600000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	132900000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	49300000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	41800000	USD
CY2021Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6500000	shares
CY2021Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	20000000	shares
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9800000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8600000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8700000	USD
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	21000000	USD
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y8M12D
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	505000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-13382000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	3274000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1738000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	818148000	USD
CY2021Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1012592000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	982248000	USD
CY2021Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	956357000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	149730000	USD
CY2021Q2	us-gaap	Gross Profit GrossProfit	212880000	USD
CY2021Q3	us-gaap	Gross Profit GrossProfit	237983000	USD
CY2021Q4	us-gaap	Gross Profit GrossProfit	229763000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	32415000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	27956000	USD
CY2021Q1	us-gaap	Profit Loss ProfitLoss	65238000	USD
CY2021Q2	us-gaap	Profit Loss ProfitLoss	110932000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	172256000	USD
CY2021Q4	us-gaap	Profit Loss ProfitLoss	126698000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	63107000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	108832000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	170980000	USD
CY2021Q4	us-gaap	Net Income Loss NetIncomeLoss	125601000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.05
CY2021Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.24
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.11
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.92
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.01
CY2021Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.21
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2021Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	602919000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	500168000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	619105000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	675851000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	94204000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	97009000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	118325000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	122344000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	33951000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	28487000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	43957000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	37254000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	42702000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	36420000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.50
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.10
CY2021	dei	Auditor Location AuditorLocation	Memphis, Tennessee

Files In Submission

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$MLI
MUELLER INDUSTRIES INC Stock $mli

2021 Q4 Form 10-K Financial Statement

#000008943922000013 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MLI MUELLER INDUSTRIES INC Stock $mli

2021 Q4 Form 10-K Financial Statement

#000008943922000013 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MLI
MUELLER INDUSTRIES INC Stock $mli