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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash Flows from Operating Activities:    
Net income $ 576.0 $ 818.2
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 386.8 338.0
Amortization of deferred financing costs 1.6 1.5
Share-based compensation expense 32.5 28.7
Deferred income tax (benefit) provision (7.7) 47.3
Net loss on asset disposals 5.2 11.1
Pension and post-retirement benefits expense, net of contributions (35.8) (48.1)
Other, net 11.0 4.0
Increase in assets -    
Accounts receivable (13.4) (41.6)
Inventories (8.8) (92.8)
Prepaid expenses and other current assets (6.8) (20.1)
Increase (decrease) in liabilities -    
Accounts payable (1.1) 8.9
Accrued liabilities (3.8) 18.6
Federal and state income taxes payable/receivable 44.1 1.2
Net cash provided by operating activities 979.8 1,074.9
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (328.6) (577.1)
Additions to other long term assets (2.5) (5.8)
Proceeds from asset disposals 1.5 1.8
Purchases of marketable debt securities (76.1) (98.0)
Proceeds from sales of marketable debt securities 2.2 28.4
Proceeds from maturities of marketable debt securities 72.4 66.9
Other, net 0.0 1.9
Net cash used for investing activities (331.1) (581.9)
Cash Flows from Financing Activities:    
Repayments of debt and finance lease obligations (1.4) (1.3)
Common stock dividends paid (336.9) (304.4)
Repurchases of common stock (41.5) (142.0)
Shares withheld to cover employee restricted stock taxes (15.7) (15.3)
Net cash used for financing activities (395.5) (463.0)
Net increase in cash and cash equivalents 253.2 30.0
Cash and cash equivalents, beginning of period 320.0 618.7
Cash and cash equivalents, end of period $ 573.2 $ 648.7