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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash Flows from Operating Activities:    
Net income $ 672.3 $ 584.0
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles 431.2 389.6
Amortization of deferred financing costs 4.5 1.8
Share-based compensation expense 36.6 39.6
Deferred income tax provision (benefit) 109.4 (18.0)
Net (gain) loss on asset disposals (14.7) 12.9
Pension and post-retirement benefits expense, net of contributions 6.1 (20.8)
Other, net 7.3 23.7
(Increase) decrease in assets ---    
Accounts receivable (110.6) (182.8)
Inventories (28.1) (48.8)
Prepaid expenses and other current assets 87.4 (129.7)
Increase (decrease) in liabilities --    
Accounts payable 12.0 36.1
Accrued liabilities (54.5) 158.8
Federal and state income taxes payable/receivable (48.0) 19.4
Net cash provided by operating activities 1,110.9 865.8
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (509.9) (468.4)
Acquisition of business, net of cash acquired (1,804.3) 0.0
Additions to other long-term assets (2.1) (1.9)
Proceeds from asset disposals 33.3 0.8
Purchases of available-for-sale debt securities (99.3) (91.9)
Proceeds from sales of available-for-sale debt securities 19.2 3.8
Proceeds from maturities of available-for-sale debt securities 75.7 83.1
Proceeds from maturities of held-to-maturity debt securities 0.0 400.0
Net cash used for investing activities (2,287.4) (74.5)
Cash Flows from Financing Activities:    
Repayments of debt and finance lease obligations (1.6) (401.4)
Proceeds from issuance of debt, net of discount and lender fees 1,494.1 0.0
Financing costs paid (6.5) 0.0
Common stock dividends paid (337.1) (336.5)
Shares withheld to cover employee restricted stock taxes (23.4) (24.8)
Net cash provided by (used for) financing activities 1,125.5 (762.7)
Net (decrease) increase in cash and cash equivalents (51.0) 28.6
Cash and cash equivalents, beginning of period 685.0 648.0
Cash and cash equivalents, end of period $ 634.0 $ 676.6