GOODWILL (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Line Items]
Goodwill, Beginning balance	$ 3,696.7
Goodwill of acquired businesses	45.7	[1]
Goodwill, Ending balance	3,742.4
Aggregates [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	3,316.6
Goodwill of acquired businesses	1.3	[1]
Goodwill, Ending balance	3,317.9
Asphalt [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	91.6
Goodwill of acquired businesses		[1]
Goodwill, Ending balance	91.6
Concrete [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	288.5
Goodwill of acquired businesses	44.4	[1]
Goodwill, Ending balance	332.9
Calcium [Member]
Goodwill [Line Items]
Goodwill, Beginning balance
Goodwill of acquired businesses		[1]
Goodwill, Ending balance

[1] See Note 16 for acquisitions