SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,540.7	$ 1,068.3
Gross profit		268.8	229.3
Depreciation, Depletion, Accretion & Amortization (DDA&A)		141.0	100.4
Cash and cash equivalents and restricted cash		133.0	890.9	$ 241.5	$ 1,198.0
Total assets		13,860.8	11,332.8	$ 13,682.6
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,650.7	1,125.5
Total assets	[2]	13,485.6	10,313.5
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(110.0)	(57.2)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,011.2	837.7
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[3]	1,121.2	894.9
Gross profit		242.8	223.6
Depreciation, Depletion, Accretion & Amortization (DDA&A)		103.6	80.8
Total assets	[2]	11,271.1	9,438.4
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(110.0)	(57.2)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	167.1	147.2
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	167.1	147.2
Gross profit		(2.9)	(3.0)
Depreciation, Depletion, Accretion & Amortization (DDA&A)		8.6	9.1
Total assets	[2]	588.7	564.0
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	360.5	81.3
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	360.5	81.3
Gross profit		28.2	7.8
Depreciation, Depletion, Accretion & Amortization (DDA&A)		21.1	4.0
Total assets	[2]	1,622.0	307.7
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1.9	2.1
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1.9	2.1
Gross profit		0.7	0.9
Depreciation, Depletion, Accretion & Amortization (DDA&A)		0.0	0.0
Total assets	[2]	3.8	3.4
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion & Amortization (DDA&A)		7.7	6.5
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 242.2	$ 128.4

[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] 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.

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