Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total Revenues	$ 1,994.1	$ 1,811.7	$ 5,169.0	$ 4,684.2
Total Cost of Revenues	1,318.1	1,323.9	3,629.8	3,615.1
Gross Profit	676.0	487.8	1,539.2	1,069.1
Selling, general and administrative expenses	108.1	94.9	324.1	296.0
Acquisition and integration expenses	3.3	1.8	4.5	6.1
Other operating income, net	(2.0)	(14.8)	(15.3)	(177.4)
Earnings from Operations	566.6	405.9	1,225.9	944.4
Interest expense	40.8	42.8	125.1	126.4
Other nonoperating income, net	(14.3)	(7.3)	(49.2)	(40.1)
Consolidated earnings from continuing operations before income tax expense	540.1	370.4	1,150.0	858.1
Income tax expense	109.9	79.2	237.4	189.4
Earnings from continuing operations	430.2	291.2	912.6	668.7
(Loss) Earnings from discontinued operations, net of income tax (benefit) expense	(13.6)	4.1	(25.8)	14.3
Consolidated net earnings	416.6	295.3	886.8	683.0
Less: Net (loss) earnings attributable to noncontrolling interests	(0.1)	0.0	0.4	(0.2)
Net Earnings Attributable to Martin Marietta	416.7	295.3	886.4	683.2
Consolidated Comprehensive Earnings (Loss) :
Consolidated comprehensive earnings attributable to Martin Marietta	417.1	298.3	889.6	655.7
(Loss) Earnings attributable to noncontrolling interests	(0.1)	0.0	0.4	(0.2)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 417.0	$ 298.3	$ 890.0	$ 655.5
Net Earnings (Loss) Attributable to Martin Marietta Per Common Share:
Basic from continuing operations attributable to common shareholders	$ 6.96	$ 4.67	$ 14.73	$ 10.73
Basic from discontinued operations attributable to common shareholders	(0.22)	0.07	(0.42)	0.23
Basic attributable to common shareholders	6.74	4.74	14.31	10.96
Diluted from continuing operations attributable to common shareholders	6.94	4.67	14.69	10.69
Diluted from discontinued operations attributable to common shareholders	(0.22)	0.06	(0.42)	0.23
Diluted attributable to common shareholders	$ 6.72	$ 4.73	$ 14.27	$ 10.92
Weighted-Average Common Shares Outstanding:
Basic	61.8	62.3	61.9	62.4
Diluted	62.0	62.5	62.1	62.5