Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Operating activities:
Net income	$ 31.6		$ 27.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	26.8		19.8
Stock-based compensation expense	3.7		3.4
Provision for deferred income taxes	3.2		3.4
Gains on disposition of property and other assets	(0.8)		(0.4)
(Increase) decrease in other assets	(2.4)		(1.2)
Increase (decrease) in other liabilities	0.2		1.9
Other	2.0		(1.2)
Changes in current assets and liabilities:
(Increase) decrease in receivables	(7.2)		85.2
(Increase) decrease in inventories	(7.9)		(17.5)
(Increase) decrease in other current assets	7.8		1.6
Increase (decrease) in accounts payable	14.0		(6.9)
Increase (decrease) in advance billings	(9.4)		(0.1)
Increase (decrease) in accrued liabilities	(20.1)		9.3
Net cash provided by operating activities	41.5		125.0
Investing activities:
Proceeds from disposition of property and other assets	5.1		0.7
Capital expenditures	(21.1)		(18.0)
Acquisitions, net of cash acquired	(309.4)		0.0
Net cash required by investing activities	(325.4)		(17.3)
Financing activities:
Payments to retire debt	(0.3)		(80.4)
Proceeds from issuance of debt	250.2		0.0
Shares repurchased	(2.0)		(6.0)
Dividends paid to common shareholders	(2.5)		(2.5)
Purchase of shares to satisfy employee tax on vested stock	0.0		(0.2)
Other	1.2		0.0
Net cash provided by (required by) financing activities	244.2		(89.1)
Net increase (decrease) in cash and cash equivalents	(39.7)		18.6
Cash and cash equivalents at beginning of period	240.4		99.4
Cash and cash equivalents at end of period	$ 200.7	[1]	$ 118.0

[1] Unaudited