CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 16.3	$ 31.3	$ 25.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	93.2	91.8	67.8
Amortization of debt issuance costs	1.8	1.8	2.0
Change in value of contingent consideration	2.8	0.0	7.9
Gain on sale of businesses and assets, net	(0.1)	(15.3)	(0.7)
Gains from eminent domain matter and property insurance claims	(6.0)	0.0	0.0
Impairment of goodwill and other assets	0.0	1.3	6.2
Deferred income taxes	12.2	14.6	(3.4)
Provision for doubtful accounts and customer disputes	3.2	4.6	4.6
Stock-based compensation	19.1	10.4	8.3
Other, net	(2.2)	(1.3)	0.3
Changes in assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(8.6)	(16.9)	(5.7)
Inventories	(7.8)	(2.1)	0.6
Prepaid expenses and other current assets	8.8	(2.0)	(2.8)
Other assets and liabilities	3.9	(3.0)	2.6
Accounts payable and accrued liabilities	2.2	7.6	(18.5)
Net cash provided by operating activities	138.8	122.8	94.8
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(42.7)	(39.9)	(42.7)
Payments for acquisitions, net of cash acquired	0.0	(72.3)	(295.1)
Proceeds from sale of businesses and property, plant and equipment	2.9	20.7	3.5
Proceeds from eminent domain matter and property insurance claims	6.0	2.6	0.0
Purchase of environmental credits	0.0	(2.8)	0.0
Net cash used in investing activities	(33.8)	(91.7)	(334.3)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	353.5	431.2	54.4
Repayments of revolver borrowings	(368.5)	(425.2)	(45.4)
Proceeds from issuance of debt	0.0	0.0	211.5
Proceeds from warrant and stock option exercises	0.2	0.1	2.7
Payments of other long-term obligations	(33.4)	(5.9)	(9.0)
Payments for finance leases, promissory notes and other	(32.8)	(29.6)	(20.3)
Debt issuance costs	0.0	0.0	(4.5)
Payments for Share Repurchase Program	0.0	(6.7)	0.0
Shares redeemed for employee income tax obligations	(3.2)	(1.9)	(3.1)
Other proceeds	0.0	4.6	0.0
Net cash provided by (used in) financing activities	(84.2)	(33.4)	186.3
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(0.2)	(0.3)	0.0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	20.6	(2.6)	(53.2)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	20.0	22.6	75.8
CASH AND CASH EQUIVALENTS AT END OF PERIOD	40.6	20.0	22.6
Supplemental Disclosure of Cash Flow Information:
Net cash paid for interest	45.5	45.5	41.0
Net cash paid (received) for income taxes	(7.3)	2.5	28.1
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Capital expenditures funded by finance leases and promissory notes	20.6	39.4	46.2
Acquisitions funded by contingent consideration and deferred payments	0.0	1.1	29.5
Eliminations and Reclassifications
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(39.5)	(66.3)	(50.8)
Adjustments to reconcile net income to net cash provided by operating activities:
Change in value of contingent consideration	0.0	0.0	0.0
Impairment of goodwill and other assets		0.0	0.0
Changes in assets and liabilities, excluding effects of acquisitions:
Net cash provided by operating activities	18.0	(3.1)	15.3
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0.0	0.0	0.0
Payments for acquisitions, net of cash acquired		0.0	0.0
Proceeds from sale of businesses and property, plant and equipment	0.0	0.0	0.0
Purchase of environmental credits		0.0
Net cash used in investing activities	(1.0)	(6.5)	1.8
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	0.0	0.0	0.0
Repayments of revolver borrowings	0.0	0.0	0.0
Proceeds from warrant and stock option exercises	0.0	0.0	0.0
Payments of other long-term obligations	0.0	0.0	0.0
Payments for finance leases, promissory notes and other	0.0	0.0	0.0
Debt issuance costs			0.0
Payments for Share Repurchase Program		0.0
Shares redeemed for employee income tax obligations	0.0	0.0	0.0
Other proceeds		0.0
Net cash provided by (used in) financing activities	$ (17.0)	$ 9.6	(17.1)
Polaris | Eliminations and Reclassifications
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Current liabilities			$ 14.2