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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Operating Activities              
Net income $ 167.7 $ 106.3 $ 219.5 $ 152.4 $ 406.8 $ 555.2  
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities              
Depreciation and amortization 57.5   54.4   171.7 164.5  
Deferred and noncurrent income tax charges (benefits)         0.1 15.0  
Accretion of asset retirement obligations 0.7   0.6   2.2 2.0 $ 2.7
(Gains) losses from sale of assets 0.5   (0.3)   0.6 (2.2)  
Net (increase) decrease in noncash operating working capital         (97.2) 18.8  
Other operating activities - net         26.7 18.2  
Net cash provided (required) by operating activities         510.9 771.5  
Investing Activities              
Property additions         (224.6) (223.1)  
Proceeds from sale of assets         2.3 8.5  
Investment in marketable securities         (11.3) 0.0  
Redemptions of marketable securities         18.0 0.0  
Other investing activities - net         (1.4) (0.6)  
Net cash provided (required) by investing activities         (217.0) (215.2)  
Financing Activities              
Purchase of treasury stock         (172.7) (566.9)  
Dividends paid         (24.7) (22.1)  
Borrowings of debt         8.0 0.0  
Repayments of debt         (19.6) (11.4)  
Amounts related to share-based compensation         (20.6) (19.6)  
Net cash provided (required) by financing activities         (229.6) (620.0)  
Net increase (decrease) in cash, cash equivalents, and restricted cash         64.3 (63.7)  
Cash, cash equivalents, and restricted cash at beginning of period   $ 60.5   $ 256.4 60.5 256.4 256.4
Cash, cash equivalents, and restricted cash at end of period $ 124.8   $ 192.7   $ 124.8 $ 192.7 $ 60.5