Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total Revenues	$ 958.2	$ 939.0
Total Cost of Revenues	815.8	796.1
Gross Profit	142.4	142.9
Selling, general & administrative expenses	78.7	78.3
Acquisition-related expenses	0.3	0.1
Other operating expenses and (income), net	5.6	(4.7)
Earnings from Operations	57.8	69.2
Interest expense	29.8	32.9
Other nonoperating expenses and (income), net	2.0	(1.6)
Earnings before income tax expense (benefit)	26.0	37.9
Income tax expense (benefit)	0.1	(5.0)
Consolidated net earnings	25.9	42.9
Net Earnings Attributable to Martin Marietta Materials, Inc.	25.9	42.9
Consolidated Comprehensive Earnings:
Earnings attributable to Martin Marietta Materials, Inc.	26.3	46.1
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 26.3	$ 46.1
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share:
Basic attributable to common shareholders	$ 0.42	$ 0.68
Diluted attributable to common shareholders	$ 0.41	$ 0.68
Weighted-Average Common Shares Outstanding:
Basic	62.3	62.6
Diluted	62.5	62.8
Products and Services
Total Revenues	$ 891.0	$ 878.3
Total Cost of Revenues	747.4	734.2
Freight
Total Revenues	67.2	60.7
Total Cost of Revenues	$ 68.4	$ 61.9