CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (2.8)	$ (2.6)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	23.4	22.8
Amortization of debt issuance costs	0.4	0.4
Change in value of contingent consideration	0.3	1.0
Loss on sale/disposal of assets, net	0.0	0.9
Deferred income taxes	2.2	2.2
Provision for doubtful accounts and customer disputes	0.3	0.4
Stock-based compensation	3.7	1.7
Other, net	(0.8)	(0.5)
Changes in assets and liabilities, excluding effects of acquisitions:
Accounts receivable	15.1	0.6
Inventories	(0.2)	0.7
Prepaid expenses and other current assets	(5.2)	(3.5)
Other assets and liabilities	0.3	(1.0)
Accounts payable and accrued liabilities	7.3	(1.2)
Net cash provided by operating activities	44.0	21.9
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(7.3)	(7.2)
Payments for acquisitions, net of cash acquired	(140.2)	0.0
Proceeds from sale of businesses and property, plant and equipment	0.2	0.4
Net cash used in investing activities	(147.3)	(6.8)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	170.2	76.3
Repayments of revolver borrowings	(79.9)	(74.8)
Proceeds from stock option exercises	0.0	0.2
Payments of other long-term obligations	(2.9)	(3.7)
Payments for finance leases, promissory notes and other	(8.4)	(8.1)
Proceeds from finance lease	12.2		$ 0.0
Debt issuance costs	(1.0)	0.0
Shares redeemed for employee income tax obligations	(1.1)	(1.1)
Net cash provided by (used in) financing activities	89.1	(11.2)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(14.2)	3.9
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	40.6	20.0	20.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	26.4	23.9	$ 40.6
Supplemental Disclosure of Cash Flow Information:
Net cash paid for interest	1.7	1.7
Net cash paid for income taxes	0.1	0.0
Capital expenditures funded by finance leases and promissory notes	9.7	1.3
Acquisitions funded by deferred consideration	1.7	0.0
Transfer of non-controlling interest	$ 3.3	$ 0.0