$MLI
MUELLER INDUSTRIES INC Stock $mli

$mli Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000008943920000016 Filed on February 26, 2020

Income Statement

Concept	2019 Q4	2019 Q1	2019
Revenue	$543.8M	$611.8M	$2.431B
YoY Change	-2.73%	-4.42%	-3.08%
Cost Of Revenue	$453.3M	$511.4M	$2.036B
YoY Change	-6.3%	-6.28%	-5.34%
Gross Profit	$94.36M	$100.4M	$395.0M
YoY Change	10.84%	6.35%	10.5%
Gross Profit Margin	17.35%	16.41%	16.25%
Selling, General & Admin	$40.00M	$40.65M	$162.4M
YoY Change	15.61%	19.37%	9.05%
% of Gross Profit	42.39%	40.5%	41.1%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$10.60M	$10.56M	$42.69M
YoY Change	2.91%	11.62%	7.93%
% of Gross Profit	11.23%	10.51%	10.81%
Operating Expenses	$51.00M	$40.65M	$162.4M
YoY Change	13.33%	19.37%	9.05%
Operating Profit	$43.36M	$49.18M	$191.4M
YoY Change	8.04%	3.74%	10.66%
Interest Expense	-$1.600M	$6.954M	$25.68M
YoY Change	-148.48%	17.68%	1.92%
% of Operating Profit	-3.69%	14.14%	13.42%
Other Income/Expense, Net	-$500.0K	-$172.0K	$1.684M
YoY Change	-145.45%	-130.71%	-57.55%
Pretax Income	$38.40M	$42.05M	$166.1M
YoY Change	10.98%	-0.01%	10.42%
Income Tax	$7.600M	$9.546M	$35.26M
% Of Pretax Income	19.79%	22.7%	21.23%
Net Earnings	$28.17M	$15.72M	$101.0M
YoY Change	4.89%	-34.84%	-3.34%
Net Earnings / Revenue	5.18%	2.57%	4.15%
Basic Earnings Per Share	$0.50	$0.28	$1.81
Diluted Earnings Per Share	$0.50	$0.28	$1.79
COMMON SHARES
Basic Shares Outstanding	56.95M shares	55.73M shares	55.80M shares
Diluted Shares Outstanding		56.25M shares	56.34M shares

Balance Sheet

Concept	2019 Q4	2019 Q1	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$97.90M	$97.60M	$97.90M
YoY Change	34.85%	6.55%	34.85%
Cash & Equivalents	$97.94M	$97.60M	$97.90M
Short-Term Investments
Other Short-Term Assets	$33.78M	$32.32M	$33.80M
YoY Change	26.08%	59.48%	26.12%
Inventory	$292.1M	$344.9M	$292.1M
Prepaid Expenses
Receivables	$269.9M	$309.8M	$269.9M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$693.8M	$784.5M	$693.8M
YoY Change	-1.26%	2.85%	-1.25%
LONG-TERM ASSETS
Property, Plant & Equipment	$363.1M	$369.7M	$390.1M
YoY Change	-2.02%	23.21%	5.26%
Goodwill	$153.3M	$153.1M
YoY Change	1.96%	11.72%
Intangibles	$60.08M	$61.56M
YoY Change	-3.05%	51.12%
Long-Term Investments	$48.40M	$50.70M	$48.40M
YoY Change	-16.55%	-27.67%	-16.55%
Other Assets	$25.40M	$25.90M	$25.40M
YoY Change	-2.13%	-0.79%	-2.31%
Total Long-Term Assets	$677.2M	$690.5M	$677.1M
YoY Change	1.53%	20.3%	1.53%
TOTAL ASSETS
Total Short-Term Assets	$693.8M	$784.5M	$693.8M
Total Long-Term Assets	$677.2M	$690.5M	$677.1M
Total Assets	$1.371B	$1.475B	$1.371B
YoY Change	0.1%	10.34%	0.1%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$85.64M	$107.3M	$85.60M
YoY Change	-17.45%	-7.04%	-17.53%
Accrued Expenses	$46.90M	$34.40M	$106.8M
YoY Change	21.82%	26.94%	14.96%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$7.530M	$5.000M	$7.500M
YoY Change	6.06%	-45.05%	5.63%
Total Short-Term Liabilities	$234.3M	$220.5M	$234.3M
YoY Change	0.64%	3.38%	0.64%
LONG-TERM LIABILITIES
Long-Term Debt	$378.7M	$559.8M	$378.7M
YoY Change	-22.65%	16.93%	-22.65%
Other Long-Term Liabilities	$10.13M	$19.99M	$74.70M
YoY Change	-44.37%	-7.59%	11.0%
Total Long-Term Liabilities	$388.9M	$579.8M	$453.4M
YoY Change	-23.42%	15.87%	-18.59%
TOTAL LIABILITIES
Total Short-Term Liabilities	$234.3M	$220.5M	$234.3M
Total Long-Term Liabilities	$388.9M	$579.8M	$453.4M
Total Liabilities	$708.8M	$893.1M	$727.5M
YoY Change	-12.09%	13.95%	-11.41%
SHAREHOLDERS EQUITY
Retained Earnings	$903.1M	$834.8M
YoY Change	9.5%	9.65%
Common Stock	$802.0K	$802.0K
YoY Change	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$470.2M	$476.1M
YoY Change	-0.84%	5.29%
Treasury Stock Shares	6.200M shares
Shareholders Equity	$643.5M	$565.4M	$643.5M
YoY Change
Total Liabilities & Shareholders Equity	$1.371B	$1.475B	$1.371B
YoY Change	0.1%	10.34%	0.1%

Cashflow Statement

Concept	2019 Q4	2019 Q1	2019
OPERATING ACTIVITIES
Net Income	$28.17M	$15.72M	$101.0M
YoY Change	4.89%	-34.84%	-3.34%
Depreciation, Depletion And Amortization	$10.60M	$10.56M	$42.69M
YoY Change	2.91%	11.62%	7.93%
Cash From Operating Activities	$68.60M	-$24.67M	$200.5M
YoY Change	51.1%	-6.95%	19.45%
INVESTING ACTIVITIES
Capital Expenditures	-$11.00M	-$6.800M	-$31.20M
YoY Change	-49.54%	23.64%	-18.96%
Acquisitions		$0.00	-$3.465M
YoY Change		-100.0%	-102.07%
Other Investing Activities	-$2.100M	-$8.000M	-$9.300M
YoY Change	-310.0%	-35.48%	-93.74%
Cash From Investing Activities	-$13.20M	-$14.83M	-$40.46M
YoY Change	-36.54%	-17.08%	-78.38%
FINANCING ACTIVITIES
Cash Dividend Paid		$5.574M	$22.33M
YoY Change		-1.85%	-1.67%
Common Stock Issuance & Retirement, Net		$1.763M	$1.763M
YoY Change		-73.19%	-94.75%
Debt Paid & Issued, Net		$30.47M	$206.7M
YoY Change		91.61%	20.18%
Cash From Financing Activities	-62.00M	$60.45M	-$139.7M
YoY Change	12.73%	486.63%	394.16%
NET CHANGE
Cash From Operating Activities	68.60M	-$24.67M	$200.5M
Cash From Investing Activities	-13.20M	-$14.83M	-$40.46M
Cash From Financing Activities	-62.00M	$60.45M	-$139.7M
Net Change In Cash	-6.600M	$21.87M	$20.90M
YoY Change	-78.29%	-166.66%	-142.29%
FREE CASH FLOW
Cash From Operating Activities	$68.60M	-$24.67M	$200.5M
Capital Expenditures	-$11.00M	-$6.800M	-$31.20M
Free Cash Flow	$79.60M	-$17.87M	$231.7M
YoY Change	18.45%	-14.95%	12.28%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	-318000	USD
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-28
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-28
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000089439
CY2017	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	505000	USD
CY2018	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	-2522000	USD
CY2019	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Tax OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesTax	-244000	USD
CY2018	mli	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Income Tax Expense Effect Of Change On Earnings Per Share Diluted TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpenseEffectOfChangeOnEarningsPerShareDiluted	0.08
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	836000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	770000	USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	80183004	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	80183004	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	56702997	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	56949246	shares
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2018	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2019	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-671000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	195000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	541000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1071000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	670000	USD
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Entity File Number EntityFileNumber	1-6770
CY2019	dei	Entity Registrant Name EntityRegistrantName	MUELLER INDUSTRIES, INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	25-0790410
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	150 Schilling Boulevard
CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Collierville
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	38017
CY2019	dei	City Area Code CityAreaCode	901
CY2019	dei	Local Phone Number LocalPhoneNumber	753-3200
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.01 Par Value
CY2019	dei	Trading Symbol TradingSymbol	MLI
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	1597828319	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	56995167	shares
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2507878000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2266073000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2035610000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2150400000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1940617000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	42693000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39555000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	33944000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	162358000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	148888000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	140730000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	963000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	253000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1491000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1466000	USD
CY2019	us-gaap	Severance Costs1 SeveranceCosts1	-485000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	-3681000	USD
CY2017	us-gaap	Severance Costs1 SeveranceCosts1	0	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	191403000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	172969000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	150807000	USD
CY2019	us-gaap	Interest Expense InterestExpense	25683000	USD
CY2018	us-gaap	Interest Expense InterestExpense	25199000	USD
CY2017	us-gaap	Interest Expense InterestExpense	19502000	USD
CY2019	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	1321000	USD
CY2018	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	1320000	USD
CY2017	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	7284000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1684000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3967000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2951000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	166083000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	150417000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	126972000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35257000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30952000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37884000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-24594000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-12645000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2077000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	106820000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	87011000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5260000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2361000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1413000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	100972000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	104459000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	85598000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55798000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	56782000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	56925000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	545000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	487000	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	559000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56343000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	57269000	shares
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	690000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	13174000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	57484000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.81
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.84
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.50
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.79
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.82
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.49
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	8.40
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	106820000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	87011000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7409000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-16876000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-1173000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	1147000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-3112000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	3339000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-2436000	USD
CY2019	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-839000	USD
CY2018	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-8686000	USD
CY2017	mli	Other Comprehensive Income Loss Attributable To Unconsolidated Affiliates Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossAttributableToUnconsolidatedAffiliatesNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	895000	USD
CY2019	mli	Other Comprehensive Income Other Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	0	USD
CY2018	mli	Other Comprehensive Income Other Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	0	USD
CY2017	mli	Other Comprehensive Income Other Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeOtherNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-380000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10372000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-30074000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	17272000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	116604000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	76746000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	104283000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4610000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1579000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2785000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	111994000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	75167000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	101498000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97944000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72616000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	269943000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	273417000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	292107000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	329795000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	33778000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	26790000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	693772000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	702618000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	363128000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	370633000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26922000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	153276000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	150335000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	60082000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	61971000	USD
CY2019Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	48363000	USD
CY2018Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	58042000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	25397000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	25950000	USD
CY2019Q4	us-gaap	Assets Assets	1370940000	USD
CY2018Q4	us-gaap	Assets Assets	1369549000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	7530000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	7101000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	85644000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103754000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	41673000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	38549000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5250000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	94190000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	83397000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	234287000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	232801000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	378724000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	489597000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	9126000	USD
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	14237000	USD
CY2019Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	13082000	USD
CY2018Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	14818000	USD
CY2019Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	19972000	USD
CY2018Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	20009000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	21094000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	16615000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	22388000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	10131000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	18212000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	708804000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	806289000	USD
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	802000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	802000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	278609000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	276849000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	903070000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	824737000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68770000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-79792000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	470243000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	474240000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	643468000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	548356000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	18668000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	14904000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	662136000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	563260000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1370940000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1369549000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	106232000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	106820000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	87011000	USD
CY2019	us-gaap	Depreciation Depreciation	37337000	USD
CY2018	us-gaap	Depreciation Depreciation	35118000	USD
CY2017	us-gaap	Depreciation Depreciation	30800000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5356000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4437000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3144000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	318000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	318000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	303000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-24594000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-12645000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2077000	USD
CY2019	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	485000	USD
CY2018	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	2306000	USD
CY2017	us-gaap	Proceeds From Insurance Premiums Collected ProceedsFromInsurancePremiumsCollected	500000	USD
CY2019	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	3625000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	8035000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	7450000	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	1491000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	963000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	253000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	624000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2018	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	0	USD
CY2017	mli	Business Combination Change In Fair Value Of Contingent Consideration BusinessCombinationChangeInFairValueOfContingentConsideration	0	USD
CY2019	us-gaap	Insurance Recoveries InsuranceRecoveries	485000	USD
CY2018	us-gaap	Insurance Recoveries InsuranceRecoveries	3681000	USD
CY2017	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	8744000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1466000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-428000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	170000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3160000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-6505000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	11342000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1779000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-39561000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-27512000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	86286000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	15639000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-14353000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	5325000	USD
CY2019	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-7076000	USD
CY2018	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-15680000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	10678000	USD
CY2019	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-7944000	USD
CY2018	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-14769000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	64000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-322000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-1903000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	833000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	200544000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	167892000	USD
CY2017	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2019	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	16000000	USD
CY2018	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	1968000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	43995000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3240000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	18703000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	31564000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-3465000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	167677000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	18396000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	31162000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	38481000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	46131000	USD
CY2019	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2018	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	1609000	USD
CY2017	us-gaap	Payments To Acquire Interest In Subsidiaries And Affiliates PaymentsToAcquireInterestInSubsidiariesAndAffiliates	3317000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-40457000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-187096000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-36280000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	22325000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	22705000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	196944000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	846000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	592000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2909000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	100658000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	204233000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	71475000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	206718000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	172002000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	111224000	USD
CY2019	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	4305000	USD
CY2018	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	2915000	USD
CY2017	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	3369000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1763000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	33562000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	3170000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2018	mli	Payments For Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options PaymentsForIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	726000	USD
CY2017	mli	Payments For Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options PaymentsForIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1595000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-139694000	USD
CY2019	mli	Payments For Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options PaymentsForIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1225000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-28269000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-244566000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	511000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1952000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2945000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	20904000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-49425000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-233906000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	77138000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126563000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	360469000	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
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	126563000	USD
CY2019	us-gaap	Fiscal Period FiscalPeriod	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Fiscal Years</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company’s fiscal year consists of 52 weeks ending on the last Saturday of December. These dates were </span><span style="font-family:inherit;font-size:10pt;">December 28, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;">December 29, 2018</span><span style="font-family:inherit;font-size:10pt;">, and </span><span style="font-family:inherit;font-size:10pt;">December 30, 2017</span><span style="font-family:inherit;font-size:10pt;">.</span></div>
CY2019Q4	mli	Temporary Investments TemporaryInvestments	500000	USD
CY2018Q4	mli	Temporary Investments TemporaryInvestments	600000	USD
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2019	mli	Specified Percentage Over Which Unrecognized Gains And Losses Are Amortized SpecifiedPercentageOverWhichUnrecognizedGainsAndLossesAreAmortized	0.10
CY2019	mli	Average Remaining Service Period For The Pension Plans AverageRemainingServicePeriodForThePensionPlans	P9Y
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	54000	shares
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Concentrations of Credit and Market Risk</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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 style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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>
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	200000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1000000.0	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-400000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of and Changes in Estimates</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="font-family:inherit;font-size:10pt;color:#252525;">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>
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	29500000	USD
CY2019Q1	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4800000	USD
CY2019Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	25400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2507878000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2266073000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2507878000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2266073000	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	363128000	USD
CY2018Q4	us-gaap	Noncurrent Assets NoncurrentAssets	370633000	USD
CY2017Q4	us-gaap	Noncurrent Assets NoncurrentAssets	304321000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2430616000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	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 Disposition Of Assets1 GainLossOnDispositionOfAssets1	963000	USD
CY2019	us-gaap	Severance Costs1 SeveranceCosts1	-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
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2507878000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2150400000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	39555000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	148888000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	253000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	-3681000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	172969000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	140730000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	1491000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1466000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	150807000	USD
CY2017	us-gaap	Interest Expense InterestExpense	19502000	USD
CY2017	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	7284000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2951000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	126972000	USD
CY2018	us-gaap	Interest Expense InterestExpense	25199000	USD
CY2018	mli	Environmental Remediation Expense Non Operating Properties EnvironmentalRemediationExpenseNonOperatingProperties	1320000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3967000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	150417000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2266073000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1940617000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	33944000	USD
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	31162000	USD
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	124936000	USD
CY2017	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	48155000	USD
CY2019Q4	us-gaap	Assets Assets	1370940000	USD
CY2018Q4	us-gaap	Assets Assets	1369549000	USD
CY2017Q4	us-gaap	Assets Assets	1320173000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	97944000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	72616000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	4414000	USD
CY2019Q4	us-gaap	Restricted Cash Equivalents Noncurrent RestrictedCashEquivalentsNoncurrent	98000	USD
CY2018Q4	us-gaap	Restricted Cash Equivalents Noncurrent RestrictedCashEquivalentsNoncurrent	108000	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
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	85769000	USD
CY2018Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	89641000	USD
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	48814000	USD
CY2018Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	58643000	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	163842000	USD
CY2018Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	188506000	USD
CY2019Q4	us-gaap	Inventory Adjustments InventoryAdjustments	6318000	USD
CY2018Q4	us-gaap	Inventory Adjustments InventoryAdjustments	6995000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	292107000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	329795000	USD
CY2019Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	16800000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2951000	USD
CY2018Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	18800000	USD
CY2019Q4	us-gaap	Fifo Inventory Amount FIFOInventoryAmount	87800000	USD
CY2018Q4	us-gaap	Fifo Inventory Amount FIFOInventoryAmount	91800000	USD
CY2019Q4	mli	Fifo Value Of Inventory Consigned To Others FifoValueOfInventoryConsignedToOthers	5500000	USD
CY2018Q4	mli	Fifo Value Of Inventory Consigned To Others FifoValueOfInventoryConsignedToOthers	5100000	USD
CY2019Q4	mli	Accrued Discounts And Allowances Liability Current AccruedDiscountsAndAllowancesLiabilityCurrent	53900000	USD
CY2018Q4	mli	Accrued Discounts And Allowances Liability Current AccruedDiscountsAndAllowancesLiabilityCurrent	48600000	USD
CY2019Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	6000000.0	USD
CY2018Q4	us-gaap	Deposit Liabilities Accrued Interest DepositLiabilitiesAccruedInterest	5800000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	4700000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	5000000.0	USD
CY2019	mli	Environmental Expense Non Operating Properties EnvironmentalExpenseNonOperatingProperties	900000	USD
CY2018	mli	Environmental Expense Non Operating Properties EnvironmentalExpenseNonOperatingProperties	3600000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	7000000.0	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-465000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-2914000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1150000	USD
CY2019	us-gaap	Interest Income Other InterestIncomeOther	722000	USD
CY2018	us-gaap	Interest Income Other InterestIncomeOther	624000	USD
CY2017	us-gaap	Interest Income Other InterestIncomeOther	684000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	497000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	429000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1117000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1684000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3967000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	200000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	3600000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	26922000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5250000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	22388000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27638000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0582
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y4M6D
CY2018	us-gaap	Operating Lease Cost OperatingLeaseCost	6818000	USD
CY2018	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4951000	USD
CY2018	us-gaap	Lease Cost LeaseCost	11769000	USD
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	6703000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6635000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5363000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4620000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3117000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2247000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	13750000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35732000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	8094000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	27638000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5250000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	22388000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	895311000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	891099000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	532183000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	520466000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	363128000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	370633000	USD
CY2019	us-gaap	Depreciation Depreciation	37300000	USD
CY2018	us-gaap	Depreciation Depreciation	35100000	USD
CY2017	us-gaap	Depreciation Depreciation	30800000	USD
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	179698000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	49405000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	130293000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	22819000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-2777000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	150335000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1999000	USD
CY2019	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	-534000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	1476000	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
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	5400000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	4400000	USD
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	3100000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5203000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4916000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4836000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4525000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4378000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	36224000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	60082000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	198559000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	228214000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	87218000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	114257000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	147801000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	175371000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	51219000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	57216000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	488270000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	509517000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	58494000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Gross Profit Loss EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss	59385000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-44053000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-20049000	USD
CY2019Q4	mli	Long Term Debt Including Unamortized Discount Premium And Debt Issuance Costs LongTermDebtIncludingUnamortizedDiscountPremiumAndDebtIssuanceCosts	386792000	USD
CY2018Q4	mli	Long Term Debt Including Unamortized Discount Premium And Debt Issuance Costs LongTermDebtIncludingUnamortizedDiscountPremiumAndDebtIssuanceCosts	497555000	USD
CY2019Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	538000	USD
CY2018Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	857000	USD
CY2019Q4	us-gaap	Debt Current DebtCurrent	7530000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	7101000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	378724000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	489597000	USD
CY2017Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	3.00
CY2017Q1	mli	Common Stock Dividends Per Share Paid In Kind CommonStockDividendsPerSharePaidInKind	5.00
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	7530000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	90502000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	525000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	804000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	540000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	286891000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	386792000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	25400000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	25957000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	25349000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	19716000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	274000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	150000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	214000	USD
CY2019	us-gaap	Interest Expense InterestExpense	25683000	USD
CY2018	us-gaap	Interest Expense InterestExpense	25199000	USD
CY2017	us-gaap	Interest Expense InterestExpense	19502000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	25200000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	13800000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-1600000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	-900000	USD
CY2019	mli	Payable Maximum Period To Be Considered Current PayableMaximumPeriodToBeConsideredCurrent	P12M
CY2017	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	1100000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.041
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	183486000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	164603000	USD
CY2019Q4	mli	Approximate Percentage Of Mutual Funds Actively Managed ApproximatePercentageOfMutualFundsActivelyManaged	0.80
CY2019Q4	mli	Approximate Percentage Of Mutual Funds Indexed Funds ApproximatePercentageOfMutualFundsIndexedFunds	0.20
CY2019Q4	mli	Percentage Of Mutual Funds Assets Invested In Us Equities PercentageOfMutualFundsAssetsInvestedInUSEquities	0.10
CY2019Q4	mli	Percent Of Mutual Funds Assets Invested In Non Us Equities PercentOfMutualFundsAssetsInvestedInNonUsEquities	0.28
CY2019Q4	mli	Percent Of Mutual Funds Assets Invested In Us Fixed Income Securities PercentOfMutualFundsAssetsInvestedInUSFixedIncomeSecurities	0.62
CY2018Q4	mli	Approximate Percentage Of Mutual Funds Actively Managed ApproximatePercentageOfMutualFundsActivelyManaged	0.61
CY2018Q4	mli	Approximate Percentage Of Mutual Funds Indexed Funds ApproximatePercentageOfMutualFundsIndexedFunds	0.39
CY2018Q4	mli	Percentage Of Mutual Funds Assets Invested In Us Equities PercentageOfMutualFundsAssetsInvestedInUSEquities	0.05
CY2018Q4	mli	Percent Of Mutual Funds Assets Invested In Non Us Equities PercentOfMutualFundsAssetsInvestedInNonUsEquities	0.35
CY2018Q4	mli	Percent Of Mutual Funds Assets Invested In Us Fixed Income Securities PercentOfMutualFundsAssetsInvestedInUSFixedIncomeSecurities	0.59
CY2018Q4	mli	Percent Of Mutual Funds Assets Invested In Non Us Fixed Income Securities PercentOfMutualFundsAssetsInvestedInNonUsFixedIncomeSecurities	0.01
CY2019Q4	mli	Number Of Collective Bargaining Agreements NumberOfCollectiveBargainingAgreements	2	bargain_agreement
CY2019	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	1200000	USD
CY2018	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	1300000	USD
CY2019	mli	Maximum Percentage Of Employer Contributions MaximumPercentageOfEmployerContributions	0.05
CY2019	mli	Multiemployer Plans Funded Status Percent MultiemployerPlansFundedStatusPercent	0.89
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5400000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5100000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5100000	USD
CY2019	mli	Coal Industry Retiree Health Benefit Act Of1992 Plan Contributions CoalIndustryRetireeHealthBenefitActOf1992PlanContributions	223000	USD
CY2018	mli	Coal Industry Retiree Health Benefit Act Of1992 Plan Contributions CoalIndustryRetireeHealthBenefitActOf1992PlanContributions	153000	USD
CY2017	mli	Coal Industry Retiree Health Benefit Act Of1992 Plan Contributions CoalIndustryRetireeHealthBenefitActOf1992PlanContributions	182000	USD
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CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense	12900000	USD
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CY2019Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	20000000	shares
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CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	611781000	USD
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Files In Submission

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$MLI
MUELLER INDUSTRIES INC Stock $mli

2019 Q4 Form 10-K Financial Statement

#000008943920000016 Filed on February 26, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MLI MUELLER INDUSTRIES INC Stock $mli

2019 Q4 Form 10-K Financial Statement

#000008943920000016 Filed on February 26, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MLI
MUELLER INDUSTRIES INC Stock $mli