SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,954.3	$ 1,361.0	$ 3,495.0	$ 2,429.4
Gross profit		446.2	398.4	714.9	627.6
Depreciation, Depletion, Accretion & Amortization (DDA&A)		143.0	103.1	284.0	203.5
Cash and cash equivalents and restricted cash		123.7	968.4	123.7	968.4	$ 241.5	$ 1,198.0
Total assets		14,181.5	11,571.0	14,181.5	11,571.0	$ 13,682.6
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	2,100.3	1,436.1	3,751.1	2,561.6
Total assets	[2],[3]	13,743.7	10,389.8	13,743.7	10,389.8
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(146.0)	(75.1)	(256.1)	(132.2)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,255.8	1,050.3	2,266.9	1,888.1
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	1,401.8	1,125.4	2,523.0	2,020.3
Gross profit		402.4	373.8	645.2	597.5
Depreciation, Depletion, Accretion & Amortization (DDA&A)		107.3	84.3	210.9	165.1
Total assets	[2],[3]	11,345.3	9,492.9	11,345.3	9,492.9
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(146.0)	(75.1)	(256.1)	(132.2)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	274.8	212.6	442.0	359.7
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[5]	274.8	212.6	442.0	359.7
Gross profit		13.6	13.5	10.7	10.5
Depreciation, Depletion, Accretion & Amortization (DDA&A)		8.5	9.1	17.1	18.2
Total assets	[2],[3]	631.6	579.2	631.6	579.2
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	422.3	96.2	782.8	177.6
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	422.3	96.2	782.8	177.6
Gross profit		30.0	10.3	58.2	18.1
Depreciation, Depletion, Accretion & Amortization (DDA&A)		20.7	4.0	41.8	8.0
Total assets	[2],[3]	1,762.7	314.2	1,762.7	314.2
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1.4	1.9	3.3	4.0
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1.4	1.9	3.3	4.0
Gross profit		0.2	0.8	0.8	1.5
Depreciation, Depletion, Accretion & Amortization (DDA&A)		0.1	0.0	0.1	0.1
Total assets	[2],[3]	4.1	3.5	4.1	3.5
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0	0.0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion & Amortization (DDA&A)		6.4	5.7	14.1	12.1
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 314.1	$ 212.8	$ 314.1	$ 212.8

[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] Certain temporarily idled assets are included within a segment's Identifiable Assets but the associated DDA&A is shown within Other in the DDA&A section above as the related DDA&A is excluded from segment gross profit.

[3] The increases in Aggregates, Concrete and General corporate Identifiable Assets are largely attributable to the August 2021 U.S. Concrete acquisition (see Note 16).

[4] 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.

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