ACQUISITIONS AND DIVESTITURES (Narrative) (Details)			3 Months Ended			9 Months Ended		12 Months Ended
		Aug. 26, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Significant Acquisitions and Disposals [Line Items]
Goodwill	[1]					$ 58,700,000
Gain on sale of property, plant & equipment and businesses			$ 23,800,000	$ 2,900,000		28,400,000	$ 120,300,000
Assets held for sale				$ 0			$ 0	$ 0
Acquisitions 2022 [Member]
Significant Acquisitions and Disposals [Line Items]
Total consideration						593,400,000
Amortizable intangible assets recognized						$ 61,200,000
Estimated weighted-average amortization period of intangible assets						15 years
Intangible assets amortization period, tax purposes						15 years
Goodwill						$ 12,100,000
Goodwill, deductible for income tax purposes			0			0
Acquisitions 2021 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized								685,500,000
Goodwill								571,200,000
Goodwill, deductible for income tax purposes								106,000,000.0
U.S. Concrete [Member]
Significant Acquisitions and Disposals [Line Items]
Total consideration		$ 1,634,500,000				1,634,500,000
Goodwill						571,200,000
Changes in carrying amount of goodwill						46,600,000
California [Member]
Significant Acquisitions and Disposals [Line Items]
Consideration transferred, net of assets divested					$ 12,900,000
Gain on sale of property, plant & equipment and businesses			$ 23,500,000		$ 114,700,000
California [Member] | Immaterial Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Total consideration								$ 4,900,000
Aggregates [Member]
Significant Acquisitions and Disposals [Line Items]
Goodwill	[1]					$ 13,300,000
Aggregates [Member] | California [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						8
Aggregates [Member] | Texas [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						5
Asphalt Mix [Member] | California [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						4
Ready-Mixed Concrete Facilities [Member] | California [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						7
Ready-Mixed Concrete Facilities [Member] | Virginia [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						4
Idle Ready-Mixed Concrete Sites [Member] | Virginia [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | item						2
Amortizable Intangible Asset Straight-Line Method [Member] | Acquisitions 2021 [Member]
Significant Acquisitions and Disposals [Line Items]
Estimated weighted-average amortization period of intangible assets						15 years

[1] See Note 16 for acquisitions.