Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Total Revenues	$ 1,820.8	$ 1,641.7	$ 3,174.9	$ 2,872.5
Total Cost of Revenues	1,260.4	1,216.5	2,311.7	2,291.2
Gross Profit	560.4	425.2	863.2	581.3
Selling, general and administrative expenses	111.6	104.1	216.0	201.2
Acquisition and integration expenses	0.4	2.9	1.2	4.3
Other operating income, net	(14.9)	(160.4)	(13.3)	(162.6)
Earnings from Operations	463.3	478.6	659.3	538.4
Interest expense	42.2	43.1	84.3	83.6
Other nonoperating income, net	(18.7)	(22.0)	(34.9)	(32.9)
Earnings from continuing operations before income tax expense	439.8	457.5	609.9	487.7
Income tax expense	91.9	104.4	127.5	110.2
Earnings from continuing operations	347.9	353.1	482.4	377.5
Earnings (Loss) from discontinued operations, net of income tax expense (benefit)	0.7	13.3	(12.2)	10.2
Consolidated net earnings	348.6	366.4	470.2	387.7
Less: Net earnings (loss) attributable to noncontrolling interests	0.3	(0.1)	0.5	(0.2)
Net Earnings Attributable to Martin Marietta	348.3	366.5	469.7	387.9
Consolidated Comprehensive Earnings (Loss) :
Consolidated comprehensive earnings attributable to Martin Marietta	350.0	367.7	472.5	357.4
Earnings (Loss) attributable to noncontrolling interests	0.2	(0.1)	0.5	(0.2)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 350.2	$ 367.6	$ 473.0	$ 357.2
Net Earnings (Loss) Attributable to Martin Marietta Per Common Share:
Basic from continuing operations attributable to common shareholders	$ 5.61	$ 5.66	$ 7.78	$ 6.06
Basic from discontinued operations attributable to common shareholders	0.01	0.21	(0.2)	0.16
Basic attributable to common shareholders	5.62	5.87	7.58	6.22
Diluted from continuing operations attributable to common shareholders	5.60	5.65	7.76	6.04
Diluted from discontinued operations attributable to common shareholders	0.01	0.21	(0.20)	0.16
Diluted attributable to common shareholders	$ 5.61	$ 5.86	$ 7.56	$ 6.20
Weighted-Average Common Shares Outstanding:
Basic	61.9	62.4	62.0	62.4
Diluted	62.1	62.5	62.2	62.6