ACQUISITIONS AND DIVESTITURES (Schedule of Business Acquisitions) (Details) - USD ($) $ in Millions			6 Months Ended
		Aug. 26, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Significant Acquisitions And Disposals [Line Items]
Noncontrolling interest			$ (23.1)	$ (0.0)	$ (23.0)	$ (22.7)	$ (0.0)	$ (0.0)
Goodwill	[1]		45.7
Cash			188.1	$ 0.0
Acquisitions 2022 [Member]
Significant Acquisitions And Disposals [Line Items]
Cash			188.1
Payable to seller			45.4
Total fair value of purchase consideration			233.5
Accounts and notes receivable, net			4.5
Inventories			4.8
Property, plant & equipment			187.0
Liabilities assumed			(4.1)
Net identifiable assets acquired			233.5
Goodwill			0.0
Acquisitions 2022 [Member] | Contractual Rights In Place [Member]
Significant Acquisitions And Disposals [Line Items]
Intangible assets			41.3
U.S. Concrete, Inc. [Member]
Significant Acquisitions And Disposals [Line Items]
Cash	[2]		1,634.5
Total fair value of purchase consideration		$ 1,634.5	1,634.5
Accounts and notes receivable, net			237.3
Inventories			80.6
Other current assets			8.8
Property, plant & equipment			1,086.2
Operating lease right-of-use assets			217.6
Other noncurrent assets			5.3
Deferred income taxes, net			(245.4)
Debt assumed			(443.7)
Other liabilities assumed			(543.1)
Noncontrolling interest			(22.3)
Net identifiable assets acquired			1,064.2
Goodwill			570.3
Cash		1,268.5
Obligations paid on acquisition date		384.4
Cash acquired		$ 18.4
U.S. Concrete, Inc. [Member] | Contractual Rights In Place [Member]
Significant Acquisitions And Disposals [Line Items]
Intangible assets			622.6
U.S. Concrete, Inc. [Member] | Other Intangibles [Member]
Significant Acquisitions And Disposals [Line Items]
Intangible assets			$ 60.3

[1] See Note 16 for acquisitions

[2] Includes $1,268.5 million paid to acquire all issued and outstanding shares of U.S. Concrete common stock and $384.4 million of U.S. Concrete obligations paid on the acquisition date, less $18.4 million of cash acquired