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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES        
Net income (loss) $ (4,463.8) $ (23.6) $ 866.8 $ 181.8
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Deferred income tax expense (benefit) (18.2) (21.3) (786.4) 7.9
Depreciation expense 159.6 66.1 101.1 91.2
Loss on extinguishment of debt 0.0 0.0 29.2 0.0
Net gain on sale of property (6.0) (21.2) (28.6) (141.2)
Accretion of discount on notes receivable from ARO 0.0 20.8 28.3 44.9
Share-based compensation expense 4.8 4.3 27.3 17.4
EQUITY IN EARNINGS OF ARO 3.1 6.1 13.3 24.5
Net periodic pension and retiree medical income (5.4) (8.7) (0.9) (16.4)
Loss on impairment 756.5 0.0 0.0 34.5
Non-cash reorganization items, net 3,487.3 0.0 0.0 0.0
Changes in deferred costs 22.2 (34.7) (26.1) (38.8)
Changes in contract liabilities (36.2) 20.8 4.9 62.4
Other (7.8) (1.6) (6.7) (8.3)
Changes in operating assets and liabilities 77.1 20.0 121.8 (6.6)
Contributions to pension plans and other post-retirement benefits (22.5) (2.7) (6.7) (4.1)
Net cash provided by (used in) operating activities (39.9) (26.3) 267.5 127.0
INVESTING ACTIVITIES        
Additions to property and equipment (8.7) (50.2) (696.1) (207.0)
Net proceeds from disposition of assets 30.1 25.1 30.3 150.3
Purchases of short-term investments 0.0 0.0 0.0 (220.0)
Maturities of short-term investments 0.0 0.0 0.0 220.0
Repayment of note receivable from ARO 0.0 0.0 0.0 40.0
Net Cash Provided by (Used in) Investing Activities, Total 21.4 (25.1) (665.8) (16.7)
FINANCING ACTIVITIES        
Reduction of long-term borrowings 0.0 0.0 (571.8) 0.0
Payments for Repurchase of Common Stock 0.0 0.0 (198.6) 0.0
Payments of Debt Issuance Costs (1.4) 0.0 (38.6) 0.0
Payments for tax withholdings for share-based awards 0.0 0.0 (5.4) (2.5)
Consent solicitation fees 0.0 0.0 0.0 (3.9)
Payments to Predecessor creditors (129.9) 0.0 0.0 0.0
Other 0.0 0.0 (3.1) 0.0
Net cash provided by (used in) financing activities 388.7 0.0 285.5 (6.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 370.2 (51.4) (112.8) 103.9
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 696.0 644.6 635.7 748.5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD (696.0) (644.6) (635.7) (748.5)
Second Lien Notes        
FINANCING ACTIVITIES        
Issuance of Second Lien Notes 0.0 0.0 1,103.0 0.0
First Lien Notes        
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes $ 520.0 $ 0.0 $ 0.0 $ 0.0