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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES        
Net income $ 979.1 $ 369.8 $ 866.8  
Adjustments to reconcile net income to net cash provided by operating activities:        
Deferred Income Tax Expense (Benefit) (515.1) 5.8 (786.4)  
Depreciation expense 146.3 122.1 101.1  
Loss on extinguishment of debt 0.0 0.0 29.2  
Gain (Loss) on Disposition of Assets (118.6) 0.2 (28.6)  
Accretion of discount on the Notes Receivable from ARO 24.7 40.0 28.3  
Share-based compensation expense 25.2 27.7 27.3  
EQUITY IN EARNINGS (LOSSES) OF ARO 8.4 (11.0) 13.3  
Loss on impairment 27.3 0.0 0.0  
Increase (Decrease) in Deferred Charges 16.1 39.3 (26.1)  
Increase (Decrease) in Contract with Customer, Asset (10.3) (1.0) 0.6  
Increase (Decrease) in Contract with Customer, Liability (41.0) (31.7) 4.9  
Other (8.0) (6.9) (5.8)  
Changes in operating assets and liabilities 78.9 (133.2) 121.2  
Contributions to pension plans and other post-retirement benefits (16.6) (21.5) (6.7)  
Net cash provided by operating activities 546.2 355.4 267.5  
INVESTING ACTIVITIES        
Additions to property and equipment (343.5) (455.1) (696.1)  
Proceeds from disposition of assets 137.9 2.8 30.3  
Net Cash Provided by (Used in) Investing Activities, Total (205.6) (452.3) (665.8)  
FINANCING ACTIVITIES        
Reduction of long-term borrowings 0.0 0.0 (571.8)  
Payments for Repurchase of Common Stock (100.0) (126.4) (198.6)  
Payments of Debt Issuance Costs 0.0 (0.8) (38.6)  
Payment, Tax Withholding, Share-Based Payment Arrangement (3.6) (29.9) (5.4)  
Other 0.0 (1.2) (3.1)  
Net cash provided by (used in) financing activities (103.6) (158.3) 285.5  
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 237.0 (255.2) (112.8)  
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 617.5 380.5 635.7 $ 748.5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD (617.5) (380.5) (635.7) $ (748.5)
Second Lien Notes        
FINANCING ACTIVITIES        
Proceeds from Issuance of Long-Term Debt $ 0.0 $ 0.0 $ 1,103.0