Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total Revenues	$ 982.4	$ 958.2
Total Cost of Revenues	807.7	815.8
Gross Profit	174.7	142.4
Selling, general & administrative expenses	79.8	78.7
Acquisition-related expenses	1.2	0.3
Other operating (income) and expenses, net	(5.6)	5.6
Earnings from Operations	99.3	57.8
Interest expense	27.4	29.8
Other nonoperating (income) and expenses, net	(9.5)	2.0
Earnings before income tax expense	81.4	26.0
Income tax expense	15.9	0.1
Consolidated net earnings	65.5	25.9
Less: Net earnings attributable to noncontrolling interests	0.2
Net Earnings Attributable to Martin Marietta Materials, Inc.	65.3	25.9
Consolidated Comprehensive Earnings:
Earnings attributable to Martin Marietta Materials, Inc.	68.1	26.3
Earnings attributable to noncontrolling interests	0.2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 68.3	$ 26.3
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share:
Basic attributable to common shareholders	$ 1.05	$ 0.42
Diluted attributable to common shareholders	$ 1.04	$ 0.41
Weighted-Average Common Shares Outstanding:
Basic	62.3	62.3
Diluted	62.5	62.5
Products and Services
Total Revenues	$ 921.9	$ 891.0
Total Cost of Revenues	746.0	747.4
Freight
Total Revenues	60.5	67.2
Total Cost of Revenues	$ 61.7	$ 68.4