CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (25.3)	$ 3.7
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	50.1	48.6
Loss on extinguishment of debt	5.5	0.0
Amortization of debt issuance costs	1.0	1.0
Change in value of contingent consideration	(0.1)	(5.5)
Gain on sale/disposal of assets and business, net	(1.6)	(0.1)
Deferred income taxes	5.8	2.6
Provision for doubtful accounts and customer disputes	1.0	1.0
Stock-based compensation	17.6	6.2
Other, net	1.0	(0.8)
Changes in assets and liabilities, excluding effects of acquisitions:
Accounts receivable	18.0	24.9
Inventories	(13.1)	1.7
Prepaid expenses and other current assets	(10.7)	(3.0)
Other assets and liabilities	(4.4)	2.7
Accounts payable and accrued liabilities	(40.4)	1.1
Net cash provided by operating activities	4.4	84.1
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(46.0)	(14.2)
Proceeds from sale of business and property, plant and equipment	3.0	0.3
Payments for acquisition of businesses	(0.2)	(140.2)
Net cash used in investing activities	(43.2)	(154.1)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	274.4	260.8
Repayments of revolver borrowings	(277.4)	(204.3)
Proceeds from issuance of term loans	296.2	0.0
Repayment of senior unsecured notes	(200.0)	0.0
Premium paid on early retirement of debt	(3.2)	0.0
Payments for acquisition-related liabilities	(8.2)	(9.9)
Payments for finance leases, promissory notes and other	(17.6)	(10.8)
Shares redeemed for employee income tax obligations	(14.3)	(1.2)
Proceeds from finance leases and other	0.0	14.5
Debt issuance costs	(1.2)	(2.2)
Net cash provided by financing activities	48.7	46.9
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(0.1)	0.0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	9.8	(23.1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	11.1	40.6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	20.9	17.5
Supplemental Disclosure of Cash Flow Information:
Net cash paid for interest	18.2	22.6
Net cash paid for (refund from) income taxes	1.8	(0.1)
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Capital expenditures funded by finance leases and promissory notes	11.6	13.7
Net right-of-use assets obtained in exchange for operating lease liabilities	4.5	7.4
Acquisitions funded by deferred consideration	0.0	1.7
Transfer of non-controlling interest	$ 0.0	$ 3.3