Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total Revenues	$ 5,414.0	$ 4,729.9	$ 4,739.1
Total cost of revenues	4,065.6	3,477.1	3,560.1
Gross Profit	1,348.4	1,252.8	1,179.0
Selling, general and administrative expenses	351.0	305.9	302.7
Acquisition-related expenses, net	57.9	1.3	0.5
Other operating income, net	(34.3)	(59.8)	(9.1)
Earnings from Operations	973.8	1,005.4	884.9
Interest expense	142.7	118.1	129.3
Other nonoperating (income) and expenses, net	(24.4)	(2.0)	7.3
Earnings from continuing operations before income tax expense	855.5	889.3	748.3
Income tax expense	153.2	168.2	136.3
Earnings from continuing operations	702.3	721.1	612.0
Earnings from discontinued operations, net of income tax expense	0.5
Consolidated net earnings	702.8	721.1	612.0
Less: Net earnings attributable to noncontrolling interests	0.3	0.1	0.1
Net Earnings Attributable to Martin Marietta	$ 702.5	$ 721.0	$ 611.9
Net Earnings Attributable to Martin Marietta Per Common Share (see Note A)
Basic from continuing operations attributable to common shareholders	$ 11.25	$ 11.56	$ 9.77
Basic from discontinued operations attributable to common shareholders	0.01
Basic attributable to common shareholders	11.26	11.56	9.77
Diluted from continuing operations attributable to common shareholders	11.21	11.54	9.74
Diluted from discontinued operations attributable to common shareholders	0.01
Diluted attributable to common shareholders	$ 11.22	$ 11.54	$ 9.74
Weighted-Average Common Shares Outstanding
Basic	62.4	62.3	62.5
Diluted	62.6	62.4	62.7
Products and Services
Total Revenues	$ 5,084.7	$ 4,432.1	$ 4,422.3
Total cost of revenues	3,735.7	3,175.6	3,239.1
Freight
Total Revenues	329.3	297.8	316.8
Total cost of revenues	$ 329.9	$ 301.5	$ 321.0