Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net income	$ 198.3	$ 380.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles	208.5	190.7
Amortization of deferred financing costs	1.3	4.3
Share-based compensation expense	17.8	18.6
Deferred income tax provision	19.2	26.9
Loss on asset disposals	2.3	1.9
Goodwill impairment	55.2
Pension and post-retirement benefits expense, net of contributions	(1.1)	11.3
Other, net	14.1	8.7
(Increase) decrease in assets —
Accounts receivable	28.3	(44.9)
Inventories	(40.4)	(20.1)
Prepaid expenses and other current assets	(14.9)	(21.2)
Increase (decrease) in liabilities —
Accounts payable	(37.8)	(1.8)
Accrued liabilities	(7.7)	(22.3)
Federal and state income taxes payable / receivable	20.4	5.9
Net cash provided by operating activities	463.5	538.4
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	(151.2)	(170.9)
Additions to other long term assets	(5.1)	(1.8)
Redemptions of marketable debt securities, net of purchases	23.2
Proceeds from disposals	4.3	1.2
Other, net		(1.3)
Net cash used for investing activities	(128.8)	(172.8)
Cash Flows from Financing Activities:
Repayments of debt and finance lease obligations	(0.8)	(0.7)
Common stock dividends paid	(149.7)	(149.3)
Shares withheld to cover employee restricted stock taxes	(10.4)	(7.7)
Net cash used for financing activities	(160.9)	(157.7)
Net increase in cash and cash equivalents	173.8	207.9
Cash and cash equivalents, beginning of period	679.5	361.5
Cash and cash equivalents, end of period	$ 853.3	$ 569.4