$MLM
MARTIN MARIETTA MATERIALS INC Stock $mlm

$mlm Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000156459021006959 Filed on February 19, 2021

Income Statement

Concept	2019 Q4	2018 Q4	2018
Revenue	$1.100B	$1.020B	$4.244B
YoY Change	7.86%	5.12%	7.03%
Cost Of Revenue	$841.9M	$792.9M	$3.278B
YoY Change	6.18%	11.46%	9.49%
Gross Profit	$258.6M	$227.3M	$966.6M
YoY Change	13.77%	-12.27%	-0.55%
Gross Profit Margin	23.5%	22.28%	22.77%
Selling, General & Admin	$73.70M	$70.90M	$280.6M
YoY Change	3.95%	5.82%	7.06%
% of Gross Profit	28.5%	31.19%	29.03%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$94.50M	$90.80M	$344.0M
YoY Change	4.07%	19.79%	15.75%
% of Gross Profit	36.54%	39.95%	35.59%
Operating Expenses	$73.70M	$79.70M	$280.6M
YoY Change	-7.53%	13.21%	7.06%
Operating Profit	$184.9M	$147.6M	$690.7M
YoY Change	25.27%	-21.78%	-1.38%
Interest Expense	-$30.60M	-$33.50M	$137.1M
YoY Change	-8.66%	42.55%	49.84%
% of Operating Profit	-16.55%	-22.7%	19.85%
Other Income/Expense, Net	$2.400M	$2.500M	$22.50M
YoY Change	-4.0%	-30.56%	125.0%
Pretax Income	$156.3M	$116.0M	$576.1M
YoY Change	34.74%	-29.1%	-6.92%
Income Tax	$25.20M	$21.60M	$105.7M
% Of Pretax Income	16.12%	18.62%	18.35%
Net Earnings	$131.0M	$94.40M	$470.0M
YoY Change	38.77%	-74.97%	-34.11%
Net Earnings / Revenue	11.9%	9.25%	11.07%
Basic Earnings Per Share			$7.46
Diluted Earnings Per Share	$2.093M	$1.501M	$7.43
COMMON SHARES
Basic Shares Outstanding	62.50M	62.71M	62.90M
Diluted Shares Outstanding			63.10M

Balance Sheet

Concept	2019 Q4	2018 Q4	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$21.00M	$45.00M	$45.00M
YoY Change	-53.33%	-96.89%	-96.89%
Cash & Equivalents	$21.00M	$44.90M	$45.00M
Short-Term Investments
Other Short-Term Assets	$141.2M	$134.6M	$135.0M
YoY Change	4.89%	38.83%	39.18%
Inventory	$690.8M	$663.0M	$663.0M
Prepaid Expenses
Receivables	$573.7M	$523.3M	$511.0M
Other Receivables	$0.00	$0.00	$12.00M
Total Short-Term Assets	$1.427B	$1.366B	$1.366B
YoY Change	4.46%	-48.09%	-48.08%
LONG-TERM ASSETS
Property, Plant & Equipment	$5.206B	$5.157B	$5.157B
YoY Change	0.95%	43.54%	43.53%
Goodwill	$2.397B	$2.399B
YoY Change	-0.1%	11.05%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$133.4M	$128.0M	$128.0M
YoY Change	4.22%	25.61%	25.49%
Total Long-Term Assets	$8.705B	$8.186B	$8.185B
YoY Change	6.34%	28.68%	28.65%
TOTAL ASSETS
Total Short-Term Assets	$1.427B	$1.366B	$1.366B
Total Long-Term Assets	$8.705B	$8.186B	$8.185B
Total Assets	$10.13B	$9.551B	$9.551B
YoY Change	6.07%	6.22%	6.2%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$229.6M	$210.8M	$211.0M
YoY Change	8.92%	14.79%	14.67%
Accrued Expenses	$173.0M	$125.0M	$125.0M
YoY Change	38.4%	1.63%	1.63%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$340.0M	$390.0M	$390.0M
YoY Change	-12.82%	30.04%	30.0%
Total Short-Term Liabilities	$838.5M	$786.7M	$787.0M
YoY Change	6.58%	13.32%	13.4%
LONG-TERM LIABILITIES
Long-Term Debt	$2.434B	$2.730B	$2.730B
YoY Change	-10.87%	0.11%	0.11%
Other Long-Term Liabilities	$339.3M	$379.3M	$379.0M
YoY Change	-10.55%	62.26%	-20.71%
Total Long-Term Liabilities	$2.773B	$3.110B	$3.109B
YoY Change	-10.83%	5.02%	-3.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$838.5M	$786.7M	$787.0M
Total Long-Term Liabilities	$2.773B	$3.110B	$3.109B
Total Liabilities	$4.778B	$4.602B	$4.605B
YoY Change	3.83%	6.77%	6.77%
SHAREHOLDERS EQUITY
Retained Earnings	$2.077B	$1.693B
YoY Change	22.67%	17.58%
Common Stock	$3.419B	$3.397B
YoY Change	0.67%	0.83%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.351B	$4.946B	$4.946B
YoY Change
Total Liabilities & Shareholders Equity	$10.13B	$9.551B	$9.551B
YoY Change	6.07%	6.22%	6.2%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018
OPERATING ACTIVITIES
Net Income	$131.0M	$94.40M	$470.0M
YoY Change	38.77%	-74.97%	-34.11%
Depreciation, Depletion And Amortization	$94.50M	$90.80M	$344.0M
YoY Change	4.07%	19.79%	15.75%
Cash From Operating Activities	$316.3M	$263.6M	$705.1M
YoY Change	19.99%	9.92%	7.22%
INVESTING ACTIVITIES
Capital Expenditures	-$110.5M	-$113.8M	$376.0M
YoY Change	-2.9%	12.01%	-8.36%
Acquisitions			$1.642B
YoY Change			13471.07%
Other Investing Activities	$1.300M	$4.200M	-$1.572B
YoY Change	-69.05%	-1150.0%	-6706.3%
Cash From Investing Activities	-$109.2M	-$109.6M	-$1.948B
YoY Change	-0.36%	7.56%	404.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$100.4M
YoY Change			0.4%
Debt Paid & Issued, Net			$910.1M
YoY Change			-14.54%
Cash From Financing Activities	-235.2M	-163.1M	-158.4M
YoY Change	44.21%	-112.81%	-114.08%
NET CHANGE
Cash From Operating Activities	316.3M	263.6M	705.1M
Cash From Investing Activities	-109.2M	-109.6M	-1.948B
Cash From Financing Activities	-235.2M	-163.1M	-158.4M
Net Change In Cash	-28.10M	-9.100M	-1.402B
YoY Change	208.79%	-100.64%	-200.37%
FREE CASH FLOW
Cash From Operating Activities	$316.3M	$263.6M	$705.1M
Capital Expenditures	-$110.5M	-$113.8M	$376.0M
Free Cash Flow	$426.8M	$377.4M	$329.1M
YoY Change	13.09%	10.54%	33.08%

Facts In Submission

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CY2020	mlm	Customer Payment Terms Based On Contractual Billing CustomerPaymentTermsBasedOnContractualBilling	P30D
CY2020	mlm	Retirement Plans And Postretirement Benefits Amortized Amount Representing Percentage Of Greater Of Projected Benefit Obligation Or Pension Plan Assets RetirementPlansAndPostretirementBenefitsAmortizedAmountRepresentingPercentageOfGreaterOfProjectedBenefitObligationOrPensionPlanAssets	0.10
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	200000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62400000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62700000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63100000
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	110100000
CY2019Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	136100000
CY2018Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	78100000
CY2020	mlm	Minimum Likelihood For Recognition Of Tax Benefit Related To Uncertain Tax Position MinimumLikelihoodForRecognitionOfTaxBenefitRelatedToUncertainTaxPosition	0.50
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-26000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	89400000
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-11100000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2200000
CY2019Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	85200000
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-25000000.0
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-10500000
CY2018Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	84200000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	721000000.0
CY2019	us-gaap	Net Income Loss NetIncomeLoss	611900000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	470000000.0
CY2020	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	600000
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="text-align:justify;margin-bottom:0pt;margin-top:0pt;text-indent:0%;font-weight:bold;font-style:italic;color:#4EAD8A;font-family:Calibri;font-size:10pt;text-transform:none;font-variant: normal;">Reclassifications<span style="font-style:normal;">. </span><span style="font-weight:normal;font-style:normal;color:#000000;">Certain reclassifications were made to the comparative years’ financial statements and notes to the financial statements to conform to the December 31, 2020 presentation. Such reclassifications had no impact on the Company’s previously reported results of operations, financial position or cash flows. </span></p>
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4739100000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4244300000
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	2200000
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	2800000
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	14000000.0
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	7800000
CY2020Q4	us-gaap	Construction Contractor Receivable Retainage ConstructionContractorReceivableRetainage	10600000
CY2019Q4	us-gaap	Construction Contractor Receivable Retainage ConstructionContractorReceivableRetainage	10200000
CY2019Q4	us-gaap	Goodwill Goodwill	2396800000
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	17300000
CY2020Q4	us-gaap	Goodwill Goodwill	2414000000.0
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-1600000
CY2019	mlm	Goodwill Reclassified From Allocated To Assets Held For Sale GoodwillReclassifiedFromAllocatedToAssetsHeldForSale	-200000
CY2019	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	500000
CY2019Q4	us-gaap	Goodwill Goodwill	2396800000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	585400000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	113400000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	472000000.0
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	560400000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	101900000
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	36000000.0
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	28300000
CY2020	mlm	Finite Lived And Indefinite Lived Intangible Assets Acquired FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquired	35200000
CY2020	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	27700000
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P16Y
CY2020	mlm	Finite Lived And Indefinite Lived Intangible Assets Acquired FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquired	35200000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13400000
CY2019Q4	mlm	Accounts And Other Receivables Gross Current AccountsAndOtherReceivablesGrossCurrent	578400000
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5900000
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	4700000
CY2020Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	575100000
CY2019Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	573700000
CY2020Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	3900000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13900000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	14100000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12900000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12500000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	12300000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	12200000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	408000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	472000000.0
CY2020Q3	mlm	Business Combination Number Of Ready Mixed Concrete Operations Acquired BusinessCombinationNumberOfReadyMixedConcreteOperationsAcquired	4
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	572600000
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	564400000
CY2020Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	8400000
CY2019Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	14000000.0
CY2020Q4	mlm	Accounts And Other Receivables Gross Current AccountsAndOtherReceivablesGrossCurrent	581000000.0
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8955000000.0
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	8633500000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3712700000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3427500000
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	168600000
CY2019Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	2900000
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	667000000.0
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	643600000
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	37100000
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	41900000
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	35300000
CY2019Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	32400000
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	149900000
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	141500000
CY2020Q4	us-gaap	Inventory Gross InventoryGross	889300000
CY2019Q4	us-gaap	Inventory Gross InventoryGross	859400000
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	180300000
CY2020Q4	us-gaap	Inventory Net InventoryNet	709000000.0
CY2019Q4	us-gaap	Inventory Net InventoryNet	690800000
CY2020Q4	mlm	Land And Land Improvements Gross LandAndLandImprovementsGross	1231900000
CY2019Q4	mlm	Land And Land Improvements Gross LandAndLandImprovementsGross	1135000000.0
CY2020Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	2529700000
CY2019Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	2509800000
CY2020Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	164200000
CY2019Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	163400000
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	4782000000.0
CY2019Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	4548600000
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	209400000
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	258400000
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	37800000
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	18300000
CY2020	mlm	Maximum Consolidated Debt Reduction For Unrestricted Cash And Cash Equivalents For Debt Covenant Calculation MaximumConsolidatedDebtReductionForUnrestrictedCashAndCashEquivalentsForDebtCovenantCalculation	200000000.0
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	100000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	397600000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	124500000
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2103600000
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	2625800000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5242300000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5206000000.0
CY2020	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	376300000
CY2019	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	354400000
CY2018	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	326100000
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4200000
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5100000
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3000000.0
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	2625800000
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2773600000
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	340000000.0
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2625800000
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2433600000
CY2020Q1	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1
CY2020	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.01
CY2018	mlm	Effective Income Tax Rate Reconciliation Statutory Depletion Deduction EffectiveIncomeTaxRateReconciliationStatutoryDepletionDeduction	0.034
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	2630000000
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3080000000.00
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2770000000
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	2940000000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	91900000
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	83900000
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	15300000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	45400000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	31100000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	69600000
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	137300000
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	115000000.0
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	84900000
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	21000000.0
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	20500000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6000000.0
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8700000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1500000
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	14100000
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	29700000
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	19000000.0
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	20100000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1200000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2800000
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-1400000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-500000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	2100000
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	2300000
CY2018	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	700000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	168200000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	136300000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	105700000
CY2018	mlm	Income Tax Benefit From Operating Loss Carry Forwards Utilized During Period IncomeTaxBenefitFromOperatingLossCarryForwardsUtilizedDuringPeriod	5800000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	8900000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	15100000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	5700000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	mlm	Effective Income Tax Rate Reconciliation Statutory Depletion Deduction EffectiveIncomeTaxRateReconciliationStatutoryDepletionDeduction	0.028
CY2019	mlm	Effective Income Tax Rate Reconciliation Statutory Depletion Deduction EffectiveIncomeTaxRateReconciliationStatutoryDepletionDeduction	0.034
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.026
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	733000000.0
CY2020	mlm	Effective Income Tax Rate Reconciliation Deductions For Railroad Track Maintenance Credits EffectiveIncomeTaxRateReconciliationDeductionsForRailroadTrackMaintenanceCredits	0.013
CY2019	mlm	Effective Income Tax Rate Reconciliation Change In Tax Status Of Subsidiary EffectiveIncomeTaxRateReconciliationChangeInTaxStatusOfSubsidiary	0.017
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.033
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.012
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.189
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.182
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.183
CY2019	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	15200000
CY2019Q4	mlm	Increase Decrease In Net Earnings Per Share Related To Production Deduction Benefit IncreaseDecreaseInNetEarningsPerShareRelatedToProductionDeductionBenefit	0.24
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	69600000
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	62600000
CY2020Q4	mlm	Deferred Tax Assets Valuation And Other Reserves DeferredTaxAssetsValuationAndOtherReserves	34700000
CY2019Q4	mlm	Deferred Tax Assets Valuation And Other Reserves DeferredTaxAssetsValuationAndOtherReserves	22300000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9000000.0
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	10500000
CY2020Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	89400000
CY2019Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	85200000
CY2020Q4	mlm	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	105600000
CY2019Q4	mlm	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	114700000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2300000
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2900000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	310600000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	298200000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	8100000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	9000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	302500000
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	289200000
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	743300000
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	700800000
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	154600000
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	151700000
CY2020Q4	mlm	Deferred Tax Liabilities Right Of Use Assets DeferredTaxLiabilitiesRightOfUseAssets	111300000
CY2019Q4	mlm	Deferred Tax Liabilities Right Of Use Assets DeferredTaxLiabilitiesRightOfUseAssets	112100000
CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	27400000
CY2019Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	27400000
CY2020Q4	mlm	Deferred Tax Liabilities Employee Benefits DeferredTaxLiabilitiesEmployeeBenefits	47400000
CY2019Q4	mlm	Deferred Tax Liabilities Employee Benefits DeferredTaxLiabilitiesEmployeeBenefits	30200000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1084000000.0
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1022200000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	781500000
CY2020	mlm	Domestic And Foreign Operating Loss Carry Forward Expiration Date DomesticAndForeignOperatingLossCarryForwardExpirationDate	2040
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9000000.0
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	10500000
CY2020	mlm	Unrecognized Tax Benefits Excluding Interest And Correlative Effects UnrecognizedTaxBenefitsExcludingInterestAndCorrelativeEffects	200000
CY2019	mlm	Unrecognized Tax Benefits Excluding Interest And Correlative Effects UnrecognizedTaxBenefitsExcludingInterestAndCorrelativeEffects	1700000
CY2018	mlm	Unrecognized Tax Benefits Excluding Interest And Correlative Effects UnrecognizedTaxBenefitsExcludingInterestAndCorrelativeEffects	600000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22400000
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	900000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	100000
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	200000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	17400000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8200000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24100000
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	12800000
CY2020	mlm	Unrecognized Tax Benefits Reversed Into Income Upon The Statute Of Limitations Expiration UnrecognizedTaxBenefitsReversedIntoIncomeUponTheStatuteOfLimitationsExpiration	9700000
CY2020Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	42000000.0
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	6400000
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	103400000
CY2019Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	109800000
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	878700000
CY2020Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2020Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1037900000
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	868000000.0
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	88400000
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	58900000
CY2020Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	82600000
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	500000
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1000000.0
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-1700000
CY2020Q4	mlm	Other Postretirement Defined Benefit Plan Liabilities Current OtherPostretirementDefinedBenefitPlanLiabilitiesCurrent	1300000
CY2019Q4	mlm	Other Postretirement Defined Benefit Plan Liabilities Current OtherPostretirementDefinedBenefitPlanLiabilitiesCurrent	2000000.0
CY2020Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	11300000
CY2019Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	11000000.0
CY2020Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	12600000
CY2019Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	13000000.0
CY2020Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0650
CY2019Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0475
CY2019Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0675
CY2020Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0475
CY2020	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2028
CY2020	us-gaap	Lessee Finance Lease Option To Terminate LesseeFinanceLeaseOptionToTerminate	options to terminate the leases within one year
CY2019	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2028
CY2020	us-gaap	Description Of Defined Contribution Pension And Other Postretirement Plans DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	401(a)
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	17900000
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	17600000
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	16500000
CY2020	mlm	Percentage Of Incentive Compensation To Acquire Shares Maximum PercentageOfIncentiveCompensationToAcquireSharesMaximum	0.50
CY2020	mlm	Percentage Of Discount Rate To Market Value On Incentive Compensation PercentageOfDiscountRateToMarketValueOnIncentiveCompensation	0.20
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	58840
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	108.93
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	27401
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	86.89
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	350
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	51.64
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	31089
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	129.00
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	31089
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	129.00
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3300000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	21600000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12400000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	4800000
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	4800000
CY2020Q4	mlm	Common Stock Price CommonStockPrice	283.97
CY2016	mlm	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAvailableForGrant	800000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	30000000.0
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	34100000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	29300000
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	26300000
CY2020	mlm	Future Share Based Compensation Expense Year One FutureShareBasedCompensationExpenseYearOne	15800000
CY2020	mlm	Future Share Based Compensation Expense Year Two FutureShareBasedCompensationExpenseYearTwo	7000000.0
CY2020	mlm	Future Share Based Compensation Expense Year Three FutureShareBasedCompensationExpenseYearThree	1700000
CY2020	mlm	Future Share Based Compensation Expense Year Four FutureShareBasedCompensationExpenseYearFour	1300000
CY2020	mlm	Future Share Based Compensation Expense Year Five FutureShareBasedCompensationExpenseYearFive	500000
CY2020	mlm	Future Share Based Compensation Expense FutureShareBasedCompensationExpense	26300000
CY2020	us-gaap	Lessee Finance Lease Option To Extend LesseeFinanceLeaseOptionToExtend	options to extend the leases for up to 30 years
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	8700000
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	481900000
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	48600000
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	52700000
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	410400000
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	433900000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	459000000.0
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	486600000
CY2020Q4	mlm	Finance Lease Right Of Use Asset Property Plant And Equipment Gross FinanceLeaseRightOfUseAssetPropertyPlantAndEquipmentGross	37800000
CY2019Q4	mlm	Finance Lease Right Of Use Asset Property Plant And Equipment Gross FinanceLeaseRightOfUseAssetPropertyPlantAndEquipmentGross	18300000
CY2020Q4	mlm	Finance Lease Right Of Use Asset Accumulated Depreciation Property Plant And Equipment FinanceLeaseRightOfUseAssetAccumulatedDepreciationPropertyPlantAndEquipment	6900000
CY2019Q4	mlm	Finance Lease Right Of Use Asset Accumulated Depreciation Property Plant And Equipment FinanceLeaseRightOfUseAssetAccumulatedDepreciationPropertyPlantAndEquipment	3100000
CY2020Q4	mlm	Finance Lease Right Of Use Asset Property Plant And Equipment Net FinanceLeaseRightOfUseAssetPropertyPlantAndEquipmentNet	30900000
CY2019Q4	mlm	Finance Lease Right Of Use Asset Property Plant And Equipment Net FinanceLeaseRightOfUseAssetPropertyPlantAndEquipmentNet	15200000
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3300000
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2800000
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	21200000
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	5900000
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	24500000
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	79000000.0
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	80900000
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3600000
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3400000
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	600000
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	500000
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	16900000
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	21100000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	31300000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	33000000.0
CY2020	us-gaap	Lease Cost LeaseCost	131400000
CY2019	us-gaap	Lease Cost LeaseCost	138900000
CY2020	us-gaap	Royalty Expense RoyaltyExpense	60800000
CY2019	us-gaap	Royalty Expense RoyaltyExpense	58200000
CY2018	us-gaap	Royalty Expense RoyaltyExpense	52500000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	453000000.0
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.042
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.043
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.033
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.052
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	66400000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	4000000.0
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	60300000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2900000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	55400000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	2700000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	45300000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	2300000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	42100000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	1500000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	357000000.0
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	17900000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	626500000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	31300000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	167500000
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	6800000
CY2020Q4	mlm	Lessee Operating Lease Liability Payments Due Current LesseeOperatingLeaseLiabilityPaymentsDueCurrent	459000000.0
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	24500000
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	48600000
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3300000
CY2020Q4	mlm	Lessee Operating Lease Liability Payments Due Noncurrent LesseeOperatingLeaseLiabilityPaymentsDueNoncurrent	410400000
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	21200000
CY2020Q4	mlm	Lessee Operating Lease Liability Undiscounted Fixed Payment Commitments Of Leases But Not Yet Commenced LesseeOperatingLeaseLiabilityUndiscountedFixedPaymentCommitmentsOfLeasesButNotYetCommenced	151300000
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	122500000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000.0
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	1400000
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	200000
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5900000
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	400000
CY2018	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	500000
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	13500000
CY2020	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	14500000
CY2019	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	9100000
CY2018	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	8000000.0
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	143900000
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	121800000
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5600000
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	300000
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	600000
CY2020	mlm	Asset Retirement Obligation Liabilities Settled Recoveries AssetRetirementObligationLiabilitiesSettledRecoveries	-10300000
CY2019	mlm	Asset Retirement Obligation Liabilities Settled Recoveries AssetRetirementObligationLiabilitiesSettledRecoveries	-1200000
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	14000000.0
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	17100000
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	153800000
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	143900000
CY2020Q4	us-gaap	Accrued Insurance Noncurrent AccruedInsuranceNoncurrent	37700000
CY2019Q4	us-gaap	Accrued Insurance Noncurrent AccruedInsuranceNoncurrent	39900000
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	32000000.0
CY2020Q4	mlm	Surety Bonds SuretyBonds	390200000
CY2020Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	12500000
CY2020Q4	mlm	Guarantee Obligations Outstanding GuaranteeObligationsOutstanding	8400000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	137000000.0
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	9300000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	7600000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	6500000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	6600000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	58200000
CY2020Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	225200000
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	77000000.0
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	106700000
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	79300000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due Next Twelve Months FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueNextTwelveMonths	16400000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due Next Twelve Months RoyaltyCommitmentsFutureMinimumPaymentsDueNextTwelveMonths	18000000.0
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due Year Two FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueYearTwo	16600000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due Year Two RoyaltyCommitmentsFutureMinimumPaymentsDueYearTwo	11300000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due Year Three FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueYearThree	16900000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due Year Three RoyaltyCommitmentsFutureMinimumPaymentsDueYearThree	10400000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due Year Four FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueYearFour	17200000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due Year Four RoyaltyCommitmentsFutureMinimumPaymentsDueYearFour	9400000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due Year Five FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueYearFive	17400000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due Year Five RoyaltyCommitmentsFutureMinimumPaymentsDueYearFive	8900000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment Due After Year Five FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueAfterYearFive	35700000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due After Year Five RoyaltyCommitmentsFutureMinimumPaymentsDueAfterYearFive	61700000
CY2020Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightment	120200000
CY2020Q4	mlm	Royalty Commitments Future Minimum Payments Due RoyaltyCommitmentsFutureMinimumPaymentsDue	119700000
CY2020	mlm	Percentage Of Employees Represented In Labor Union PercentageOfEmployeesRepresentedInLaborUnion	0.10
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4729900000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4739100000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4244300000
CY2020	us-gaap	Gross Profit GrossProfit	1252800000
CY2019	us-gaap	Gross Profit GrossProfit	1179000000.0
CY2018	us-gaap	Gross Profit GrossProfit	966600000
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	305900000
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	302700000
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	280600000
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	1005400000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	884900000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	690700000
CY2020Q4	us-gaap	Assets Assets	10580800000
CY2019Q4	us-gaap	Assets Assets	10131600000
CY2018Q4	us-gaap	Assets Assets	9551400000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	393500000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	371500000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	344000000.0
CY2020	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	387200000
CY2019	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	387600000
CY2018	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	1925600000
CY2020	mlm	Property Plant And Equipment Additions Through Acquisitions PropertyPlantAndEquipmentAdditionsThroughAcquisitions	20000000.0
CY2018	mlm	Property Plant And Equipment Additions Through Acquisitions PropertyPlantAndEquipmentAdditionsThroughAcquisitions	1543200000
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	67000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4729900000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4729900000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4739100000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4244300000
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	61500000
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	54200000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4739100000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	4244300000
CY2020	us-gaap	Gross Profit GrossProfit	1252800000
CY2019	us-gaap	Gross Profit GrossProfit	1179000000.0
CY2018	us-gaap	Gross Profit GrossProfit	966600000
CY2020	mlm	Remeasurement Of Operating Lease Right Of Use Assets RemeasurementOfOperatingLeaseRightOfUseAssets	2200000
CY2019	mlm	Remeasurement Of Operating Lease Right Of Use Assets RemeasurementOfOperatingLeaseRightOfUseAssets	2000000.0
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	31900000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	45700000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	19400000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	200000
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	2400000
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	1100000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	113800000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	127900000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	137200000
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	114900000
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	101700000
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	28900000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	77700000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	76100000
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	600000
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	500000
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3500000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	11000000.0
CY2020	us-gaap	Payments For Proceeds From Policy Loans PaymentsForProceedsFromPolicyLoans	112300000000
CY2018	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	18200000
CY2019	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	6900000
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	18800000
CY2018	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	7700000
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	25300000
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	59800000
CY2019	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	9100000

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2019 Q4 Form 10-K Financial Statement

#000156459021006959 Filed on February 19, 2021

Income Statement

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$MLM MARTIN MARIETTA MATERIALS INC Stock $mlm

2019 Q4 Form 10-K Financial Statement

#000156459021006959 Filed on February 19, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MLM
MARTIN MARIETTA MATERIALS INC Stock $mlm