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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Operating Activities      
Net income $ 53.2 $ 66.0  
Adjustments to reconcile net income (loss) to net cash provided (required) by operating activities      
Depreciation and amortization 68.2 58.7  
Deferred and noncurrent income tax charges (benefits) (1.4) (0.5)  
Accretion of asset retirement obligations 0.9 0.8 $ 3.2
Amortization of discount on marketable securities 0.0 (0.1)  
(Gains) losses from sale of assets 0.3 (0.4)  
Net (increase) decrease in noncash operating working capital 0.3 4.2  
Other operating activities - net 7.0 7.3  
Net cash provided (required) by operating activities 128.5 136.0  
Investing Activities      
Property additions (87.8) (76.2)  
Proceeds from sale of assets 0.3 1.0  
Redemptions of marketable securities 0.0 1.0  
Other investing activities - net (0.2) (0.7)  
Net cash provided (required) by investing activities (87.7) (74.9)  
Financing Activities      
Purchase of treasury stock (150.0) (86.4)  
Dividends paid (9.8) (8.8)  
Borrowings of debt 670.0 0.0  
Repayments of debt (530.0) (3.9)  
Amounts related to share-based compensation (18.6) (23.1)  
Net cash provided (required) by financing activities (38.4) (122.2)  
Net increase (decrease) in cash, cash equivalents, and restricted cash 2.4 (61.1)  
Cash, cash equivalents, and restricted cash at beginning of period 47.0 117.8 117.8
Cash, cash equivalents, and restricted cash at end of period $ 49.4 $ 56.7 $ 47.0