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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash Flows from Operating Activities:    
Net income $ 373.8 $ 198.3
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 205.5 208.5
Amortization of deferred financing costs 1.3 1.3
Share-based compensation expense 20.1 17.8
Deferred income tax provision 14.3 19.2
Loss on asset disposals 5.4 2.3
Goodwill impairment 0.0 55.2
Pension and post-retirement benefits expense, net of contributions (0.3) (1.1)
Other, net 4.2 14.1
Increase in assets —    
Accounts receivable (149.0) 28.3
Inventories (39.4) (40.4)
Prepaid expenses and other current assets (34.7) (14.9)
Increase (decrease) in liabilities —    
Accounts payable (2.7) (37.8)
Accrued liabilities 15.4 (7.7)
Federal and state income taxes payable / receivable 5.9 20.4
Net cash provided by operating activities 419.8 463.5
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (216.5) (151.2)
Additions to other long term assets (1.6) (5.1)
Proceeds from asset disposals 2.4 4.3
Purchases of marketable debt securities (65.7) (20.5)
Proceeds from sales of marketable debt securities 12.9 12.3
Proceeds from maturities of marketable debt securities 48.3 31.4
Net cash used for investing activities (220.2) (128.8)
Cash Flows from Financing Activities:    
Repayments of debt and finance lease obligations (0.8) (0.8)
Financing Costs Paid (0.9) 0.0
Common stock dividends paid (189.8) (149.7)
Shares withheld to cover employee restricted stock taxes (10.5) (10.4)
Net cash used for financing activities (202.0) (160.9)
Net (decrease) increase in cash and cash equivalents (2.4) 173.8
Cash and cash equivalents, beginning of period 974.6 679.5
Cash and cash equivalents, end of period $ 972.2 $ 853.3