Consolidated and Combined Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income	$ 113.3	$ 75.7	$ 89.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	85.8	67.6	65.7
Impairment charge	0.0	23.2	0.0
Stock-based compensation expense	14.6	9.9	9.0
Provision for deferred income taxes	17.3	22.4	10.3
Gain on disposition of property and other assets	(4.0)	(1.1)	(1.4)
(Increase) decrease in other assets	(0.9)	6.4	(3.3)
Increase (decrease) in other liabilities	4.2	(1.7)	(7.6)
Other	(4.1)	(3.1)	0.1
Changes in current assets and liabilities:
(Increase) decrease in receivables	99.0	(80.9)	(26.4)
(Increase) decrease in inventories	(22.7)	(29.9)	24.3
(Increase) decrease in other current assets	(11.6)	(10.8)	(0.6)
Increase (decrease) in accounts payable	3.5	20.6	7.1
Increase (decrease) in advance billings	49.3	7.7	(9.1)
Increase (decrease) in accrued liabilities	15.1	12.5	4.2
Net cash provided by operating activities	358.8	118.5	162.0
Investing activities:
Proceeds from disposition of property and other assets	8.9	10.2	3.5
Capital expenditures	(85.4)	(44.8)	(82.4)
Acquisitions, net of cash acquired	(32.9)	(333.2)	(47.5)
Proceeds from divestitures	0.0	3.3	0.0
Net cash required by investing activities	(109.4)	(364.5)	(126.4)
Financing activities:
Payments to retire debt	(81.2)	(0.3)	(0.1)
Proceeds from issuance of debt	0.0	180.0	0.6
Shares repurchased	(11.0)	(3.0)	0.0
Dividends paid to common shareholders	(9.9)	0.0	0.0
Purchase of shares to satisfy employee tax on vested stock	(4.4)	(0.5)	0.0
Capital contribution from Former Parent	0.0	200.0	0.0
Net transfers to Former Parent and affiliates	0.0	(34.5)	(43.0)
Other	(1.9)	(3.1)	(0.3)
Net cash provided by (required by) financing activities	(108.4)	338.6	(42.8)
Net increase (decrease) in cash and cash equivalents	141.0	92.6	(7.2)
Cash and cash equivalents at beginning of period	99.4	6.8	14.0
Cash and cash equivalents at end of period	$ 240.4	$ 99.4	$ 6.8