CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 322.7	$ 367.5	$ 657.1	$ 700.6
Cost of goods sold before depreciation, depletion and amortization	250.1	296.8	524.0	565.2
Selling, general and administrative expenses	31.7	39.2	65.4	71.3
Depreciation, depletion and amortization	25.2	25.1	48.6	47.9
Change in value of contingent consideration	(5.8)	0.3	(5.5)	1.3
Loss (gain) on sale/disposal of assets, net	(0.1)	0.1	(0.1)	1.0
Operating income	21.6	6.0	24.7	13.9
Interest expense, net	11.4	11.6	22.8	23.2
Other income, net	(0.6)	(7.2)	(1.2)	(7.6)
Income (loss) before income taxes	10.8	1.6	3.1	(1.7)
Income tax expense (benefit)	4.3	0.7	(0.6)	0.0
Net income (loss)	6.5	0.9	3.7	(1.7)
Less: Net income (loss) attributable to non-controlling interest	(0.1)	0.2	0.2	0.3
Net income (loss) attributable to U.S. Concrete	$ 6.6	$ 0.7	$ 3.5	$ (2.0)
Earnings (loss) per share attributable to U.S. Concrete:
Basic earnings per share (in dollars per share)	$ 0.39	$ 0.04	$ 0.21	$ (0.12)
Diluted earnings per share (in dollars per share)	$ 0.39	$ 0.04	$ 0.21	$ (0.12)
Weighted average shares outstanding:
Basic (in shares)	16.6	16.4	16.6	16.4
Diluted (in shares)	16.6	16.4	16.6	16.4