CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 408.9	$ 404.3	$ 1,109.5	$ 1,136.3
Cost of goods sold before depreciation, depletion and amortization	321.2	325.3	886.4	912.7
Selling, general and administrative expenses	32.0	32.2	103.3	96.4
Depreciation, depletion and amortization	22.3	25.5	70.2	68.2
Change in value of contingent consideration	0.3	0.4	1.6	(0.9)
Impairment of assets	0.0	0.0	0.0	1.3
Loss (gain) on sale/disposal of assets and business, net	(0.2)	(14.1)	0.8	(14.6)
Operating income	33.3	35.0	47.2	73.2
Interest expense, net	11.6	11.7	34.8	34.6
Other income, net	(0.2)	(1.1)	(7.8)	(4.1)
Income (loss) before income taxes, equity in earnings of subsidiaries and non-controlling interest	21.9	24.4	20.2	42.7
Income tax expense	8.3	8.6	8.3	14.5
Net income	13.6	15.8	11.9	28.2
Less: Net income attributable to non-controlling interest	(0.6)	(0.2)	(0.9)	(0.2)
Net income attributable to U.S. Concrete	$ 13.0	$ 15.6	$ 11.0	$ 28.0
Earnings per share attributable to U.S. Concrete:
Basic earnings per share (in dollars per share)	$ 0.79	$ 0.95	$ 0.67	$ 1.70
Diluted earnings per share (in dollars per share)	$ 0.79	$ 0.94	$ 0.67	$ 1.70
Weighted average shares outstanding:
Basic (in shares)	16.5	16.5	16.4	16.5
Diluted (in shares)	16.5	16.5	16.4	16.5