REVENUES (Revenues by Geographic Market) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	$ 1,954.3	$ 1,361.0	$ 3,495.0	$ 2,429.4
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	2,100.3	1,436.1	3,751.1	2,561.6
Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	(146.0)	(75.1)	(256.1)	(132.2)
U.S. Concrete, Inc. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	420.2		774.0
East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	493.8	463.5	828.7	779.4
Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	827.0	674.1	1,513.4	1,253.9
West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	359.3	298.5	635.0	528.3
Aggregates [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	1,255.8	1,050.3	2,266.9	1,888.1
Aggregates [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1],[2]	1,401.8	1,125.4	2,523.0	2,020.3
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	(146.0)	(75.1)	(256.1)	(132.2)
Aggregates [Member] | U.S. Concrete, Inc. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	106.7		190.9
Aggregates [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	370.0	354.4	625.5	597.8
Aggregates [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	740.5	607.5	1,369.9	1,126.4
Aggregates [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	184.6	163.5	336.7	296.1
Asphalt [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	274.8	212.6	442.0	359.7
Asphalt [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1],[3]	274.8	212.6	442.0	359.7
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Asphalt [Member] | U.S. Concrete, Inc. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0		0.0
Asphalt [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	49.3	42.8	70.6	60.2
Asphalt [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	66.2	46.1	102.7	87.5
Asphalt [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	159.3	123.7	268.7	212.0
Concrete [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	422.3	96.2	782.8	177.6
Concrete [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	422.3	96.2	782.8	177.6
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Concrete [Member] | U.S. Concrete, Inc. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	313.5		583.1
Concrete [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	74.5	66.3	132.6	121.4
Concrete [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	18.9	18.6	37.5	36.0
Concrete [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	15.4	11.3	29.6	20.2
Calcium [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	1.4	1.9	3.3	4.0
Calcium [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	1.4	1.9	3.3	4.0
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Calcium [Member] | U.S. Concrete, Inc. [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0		0.0
Calcium [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Calcium [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	1.4	1.9	3.3	4.0
Calcium [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	$ 0.0	$ 0.0	$ 0.0	$ 0.0

[1] ¹ The geographic markets are defined by states/countries as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia and Washington D.C. Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mississippi, Oklahoma, Quintana Roo (Mexico), South Carolina and Texas West market — Arizona, California and New Mexico U.S. Concrete — British Columbia (Canada), California, Hawaii, New Jersey, New York, Oklahoma, Pennsylvania, Texas, the U.S. Virgin Islands and Washington D.C.

[2] Includes product sales (crushed stone, sand and gravel, sand, and other aggregates), as well as freight & delivery costs that we pass along to our customers, and service revenues (see Note 4) related to aggregates.

[3] Includes product sales, as well as service revenues (see Note 4) from our asphalt construction paving business.