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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
OPERATING ACTIVITIES        
Net income $ 369.8 $ 866.8 $ 181.8  
Adjustments to reconcile net income to net cash provided by operating activities:        
Deferred Income Tax Expense (Benefit) 5.8 (786.4) 7.9  
Depreciation expense 122.1 101.1 91.2  
Loss on extinguishment of debt 0.0 29.2 0.0  
Gain (Loss) on Disposition of Assets 0.2 (28.6) (141.2)  
Accretion of discount on the Notes Receivable from ARO 40.0 28.3 44.9  
Share-based compensation expense 27.7 27.3 17.4  
EQUITY IN EARNINGS (LOSSES) OF ARO (11.0) 13.3 24.5  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (2.4) (0.9) (16.4)  
Loss on impairment 0.0 0.0 34.5  
Increase (Decrease) in Deferred Charges 39.3 (26.1) (38.8)  
Increase (Decrease) in Contract with Customer, Liability (31.7) 4.9 62.4  
Other (9.3) (6.7) (8.3)  
Changes in operating assets and liabilities (134.2) 121.8 (6.6)  
Contributions to pension plans and other post-retirement benefits (21.5) (6.7) (4.1)  
Net cash provided by operating activities 355.4 267.5 127.0  
INVESTING ACTIVITIES        
Additions to property and equipment (455.1) (696.1) (207.0)  
Net proceeds from disposition of assets 2.8 30.3 150.3  
Purchases of short-term investments 0.0 0.0 (220.0)  
Maturities of short-term investments 0.0 0.0 220.0  
Repayment of note receivable from ARO 0.0 0.0 40.0  
Net Cash Provided by (Used in) Investing Activities, Total (452.3) (665.8) (16.7)  
FINANCING ACTIVITIES        
Reduction of long-term borrowings 0.0 (571.8) 0.0  
Payments for Repurchase of Common Stock (126.4) (198.6) 0.0  
Payments of Debt Issuance Costs (0.8) (38.6) 0.0  
Payment, Tax Withholding, Share-Based Payment Arrangement (29.9) (5.4) (2.5)  
Other (1.2) (3.1) (3.9)  
Net cash provided by (used in) financing activities (158.3) 285.5 (6.4)  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (255.2) (112.8) 103.9  
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 380.5 635.7 748.5 $ 644.6
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD (380.5) (635.7) (748.5) $ (644.6)
Second Lien Notes        
FINANCING ACTIVITIES        
Proceeds from Issuance of Long-Term Debt $ 0.0 $ 1,103.0 $ 0.0