CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 11.9	$ 28.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	70.2	68.2
Amortization of debt issuance costs	1.3	1.4
Change in value of contingent consideration	1.6	(0.9)
Loss (gain) on sale/disposal of assets and business, net	0.8	(14.6)
Gains from eminent domain matter and property insurance claims	(6.0)	0.0
Impairment of assets	0.0	1.3
Deferred income taxes	2.0	10.1
Provision for doubtful accounts and customer disputes	2.2	3.4
Stock-based compensation	16.4	8.1
Other, net	(1.0)	(0.8)
Changes in assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(33.9)	(44.4)
Inventories	(2.7)	(0.2)
Prepaid expenses and other current assets	2.9	(4.8)
Other assets and liabilities	(1.3)	(1.6)
Accounts payable and accrued liabilities	27.7	36.8
Net cash provided by operating activities	92.1	90.2
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(28.6)	(32.2)
Payments for acquisitions, net of cash acquired	0.0	(72.3)
Purchases of environmental credits	0.0	(2.8)
Proceeds from disposals of businesses and property, plant and equipment	1.2	18.6
Proceeds from eminent domain matter and property insurance claims	6.0	2.1
Net cash used in investing activities	(21.4)	(86.6)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	273.3	338.2
Repayments of revolver borrowings	(277.2)	(310.7)
Proceeds from stock option exercises	0.2	0.1
Payments of other long-term obligations	(33.4)	(5.6)
Payments for other financing	(24.2)	(21.5)
Treasury share purchases	(2.2)	(1.9)
Other proceeds	0.0	0.5
Net cash used in financing activities	(63.5)	(0.9)
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(0.2)	(0.1)
NET INCREASE IN CASH AND CASH EQUIVALENTS	7.0	2.6
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	20.0	22.6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	27.0	25.2
Supplemental Disclosure of Cash Flow Information:
Net cash paid for interest	24.4	24.5
Net cash paid for income taxes	2.5	2.9
Capital expenditures funded by finance leases and promissory notes	19.4	30.7
Acquisitions funded by contingent consideration	$ 0.0	$ 1.1