Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total Revenues	$ 6,160.7	$ 5,414.0	$ 4,729.9
Total cost of revenues	4,737.4	4,065.6	3,477.1
Gross Profit	1,423.3	1,348.4	1,252.8
Selling, general and administrative expenses	396.7	351.0	305.9
Acquisition and integration expenses	9.1	57.9	1.3
Other operating income, net	(189.2)	(34.3)	(59.8)
Earnings from Operations	1,206.7	973.8	1,005.4
Interest expense	169.0	142.7	118.1
Other nonoperating income, net	(53.4)	(24.4)	(2.0)
Earnings from continuing operations before income tax expense	1,091.1	855.5	889.3
Income tax expense	234.8	153.2	168.2
Earnings from continuing operations	856.3	702.3	721.1
Earnings from discontinued operations, net of income tax expense	10.5	0.5	0.0
Consolidated net earnings	866.8	702.8	721.1
Less: Net earnings attributable to noncontrolling interests	0.0	0.3	0.1
Net Earnings Attributable to Martin Marietta	$ 866.8	$ 702.5	$ 721.0
Net Earnings Attributable to Martin Marietta Per Common Share (see Note A)
Basic from continuing operations attributable to common shareholders	$ 13.74	$ 11.25	$ 11.56
Basic from discontinued operations attributable to common shareholders	0.17	0.01	0
Basic attributable to common shareholders	13.91	11.26	11.56
Diluted from continuing operations attributable to common shareholders	13.70	11.21	11.54
Diluted from discontinued operations attributable to common shareholders	0.17	0.01	0
Diluted attributable to common shareholders	$ 13.87	$ 11.22	$ 11.54
Weighted-Average Common Shares Outstanding
Basic	62.3	62.4	62.3
Diluted	62.5	62.6	62.4
Products and Services
Total Revenues	$ 5,730.5	$ 5,084.7	$ 4,432.1
Total cost of revenues	4,304.6	3,735.7	3,175.6
Freight
Total Revenues	430.2	329.3	297.8
Total cost of revenues	$ 432.8	$ 329.9	$ 301.5