SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 5,552.2	$ 4,856.8	$ 4,929.1
Gross profit		1,373.4	1,281.5	1,255.9
Depreciation, Depletion, Accretion & Amortization (DDA&A)		463.0	396.8	374.6
Capital Expenditures	[2]	450.5	363.4	404.3
Cash and cash equivalents and restricted cash		241.5	1,198.0	274.5	$ 44.4
Total assets		13,682.6	11,686.9	10,648.8
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	5,896.5	5,128.2	5,249.9
Total assets	[3],[4]	13,204.0	10,341.1	10,221.4
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(344.3)	(271.4)	(320.8)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	4,000.7	3,672.9	3,669.5
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[5]	4,345.0	3,944.3	3,990.3
Gross profit		1,295.7	1,159.2	1,146.6
Depreciation, Depletion, Accretion & Amortization (DDA&A)		360.4	321.1	305.1
Capital Expenditures	[2]	423.1	331.9	383.4
Total assets	[3],[4]	10,917.8	9,459.2	9,334.2
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(344.3)	(271.4)	(320.8)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	777.8	792.6	855.8
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[6]	777.8	792.6	855.8
Gross profit		21.2	75.2	63.0
Depreciation, Depletion, Accretion & Amortization (DDA&A)		36.0	35.0	35.2
Capital Expenditures	[2]	9.3	19.8	9.1
Total assets	[3],[4]	602.0	573.1	558.4
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	766.8	383.6	395.6
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	766.8	383.6	395.6
Gross profit		54.3	44.2	43.2
Depreciation, Depletion, Accretion & Amortization (DDA&A)		41.5	16.0	13.6
Capital Expenditures	[2]	18.1	11.7	11.6
Total assets	[3],[4]	1,680.2	305.5	325.1
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	6.9	7.7	8.2
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	6.9	7.7	8.2
Gross profit		2.2	2.9	3.1
Depreciation, Depletion, Accretion & Amortization (DDA&A)		0.2	0.2	0.2
Capital Expenditures	[2]	0.0	0.0	0.0
Total assets	[3],[4]	4.0	3.3	3.7
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0.0	0.0	0.0
Other Segments [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion & Amortization (DDA&A)		24.9	24.5	20.5
Corporate [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	[2]	0.0	0.0	0.2
Total assets		$ 237.1	$ 147.8	$ 152.9

[1] ¹ The geographic markets are defined by states 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] Capital expenditures include capitalized replacements of and additions to property, plant & equipment, including renewals and betterments. Capital expenditures exclude property, plant & equipment obtained by business acquisitions.

[3] 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.

[4] The 2021 increases in Aggregates, Concrete and General corporate Identifiable Assets are largely attributable to the U.S. Concrete acquisition (see Note 19)

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

[6] Includes product sales, as well as service revenues (see Note 2) from our asphalt construction paving business.