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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net income $ 556.8 $ 672.9 $ 396.9
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 228.7 220.4 212.6
Deferred and noncurrent income tax charges (benefits) 2.0 31.5 19.0
Accretion of asset retirement obligations 3.0 2.7 2.5
Amortization of discount on marketable securities (0.4) (0.1) 0.0
(Gains) losses from sale of assets 0.8 (2.1) (1.5)
Net (increases) decrease in noncash operating working capital (42.1) 44.8 82.8
Other operating activities - net 35.2 24.6 25.1
Net cash provided (required) by operating activities 784.0 994.7 737.4 Close
Investing Activities      
Property additions (335.6) (305.3) (274.7)
Payments for acquisition, net of cash acquired 0.0 0.0 (641.1)
Proceeds from sale of assets 2.4 8.8 3.4
Investment in marketable securities (12.8) (22.2) 0.0
Redemptions of marketable securities 24.0 0.0 0.0
Other investing activities - net (1.6) (0.6) (1.8)
Net cash provided (required) by investing activities (323.6) (319.3) (914.2) Close
Financing Activities      
Purchase of treasury stock (333.2) (806.4) (355.0)
Dividends paid (33.4) (29.9) (27.3)
Borrowings of debt 8.0 5.0 892.8
Repayments of debt (23.4) (20.2) (224.3)
Debt issuance costs 0.0 0.0 (9.9)
Amounts related to share-based compensation (21.1) (19.8) (6.7)
Net cash provided (required) by financing activities (403.1) (871.3) 269.6 Close
Net increase (decrease) in cash, cash equivalents and restricted cash 57.3 (195.9) 92.8 Close
Cash, cash equivalents and restricted cash at January 1 60.5 256.4 163.6
Cash, cash equivalents and restricted cash at December 31 $ 117.8 $ 60.5 $ 256.4