Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenues	$ 4,739.1	$ 4,244.3	$ 3,965.6
Total cost of revenues	3,560.1	3,277.7	2,993.7
Gross Profit	1,179.0	966.6	971.9
Selling, general and administrative expenses	302.7	280.6	262.1
Acquisition-related expenses, net	0.5	13.5	8.6
Other operating (income) and expenses, net	(9.1)	(18.2)	0.8
Earnings from Operations	884.9	690.7	700.4
Interest expense	129.3	137.1	91.5
Other nonoperating expenses and (income), net	7.3	(22.5)	(10.0)
Earnings before income tax expense (benefit)	748.3	576.1	618.9
Income tax expense (benefit)	136.3	105.7	(94.5)
Consolidated net earnings	612.0	470.4	713.4
Less: Net earnings attributable to noncontrolling interests	0.1	0.4	0.1
Net Earnings Attributable to Martin Marietta	$ 611.9	$ 470.0	$ 713.3
Net Earnings Attributable to Martin Marietta Per Common Share (see Note A)
Basic attributable to common shareholders	$ 9.77	$ 7.46	$ 11.30
Diluted attributable to common shareholders	$ 9.74	$ 7.43	$ 11.25
Weighted-Average Common Shares Outstanding
Basic	62.5	62.9	62.9
Diluted	62.7	63.1	63.2
Products and Services
Total revenues	$ 4,422.3	$ 3,980.4	$ 3,723.5
Total cost of revenues	3,239.1	3,009.8	2,749.5
Freight
Total revenues	316.8	263.9	242.1
Total cost of revenues	$ 321.0	$ 267.9	$ 244.2