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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, 2022	Dec. 31, 2020
OPERATING ACTIVITIES
Net income (loss)	$ (4,463.8)	$ (23.6)	$ 181.8	$ (4,857.6)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Gain (Loss) on Disposition of Assets	(6.0)	(21.2)	(141.2)	(11.8)
Depreciation	159.6	66.1	91.2	540.8
Non-cash amortization	0.0	20.8	44.9	0.0
Asset Impairment Charges	756.5	0.0	34.5	3,646.2
EQUITY IN EARNINGS (LOSSES) OF ARO	3.1	6.1	24.5	(7.8)
Share-based Payment Arrangement, Noncash Expense	4.8	4.3	17.4	21.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(5.4)	(8.7)	(16.4)	(14.6)
Amortization, Net	(4.8)	2.3	(9.0)	6.2
Deferred income tax expense	(18.2)	(21.3)	7.9	(105.7)
Amortization of Debt Discount (Premium)	0.0	0.5	1.0	36.8
Business Combination, Bargain Purchase, Gain Recognized And Adjustment	0.0	0.0	0.0	(6.3)
Debtor-in-Possession Financing Fees And Payments on Backstop Commitment Agreement	0.0	0.0	0.0	40.0
Debtor Reorganization Items, Non-cash	3,487.3	0.0	0.0	436.4
Other Noncash Income (Expense)	(7.3)	(0.3)	1.6	(30.2)
Changes in operating assets and liabilities	(68.5)	(4.7)	(35.4)	22.0
Contributions to pension plans and other post-retirement benefits	(22.5)	(2.7)	(4.1)	(12.1)
Net Cash Provided by (Used in) Operating Activities, Total	(39.8)	(26.2)	127.5	(251.7)
INVESTING ACTIVITIES
Purchases of short-term investments	0.0	0.0	(220.0)	0.0
Maturities of short-term investments	0.0	0.0	220.0	0.0
Additions to property and equipment	(8.7)	(50.2)	(207.0)	(93.8)
Proceeds from Sale of Property, Plant, and Equipment	30.1	25.1	150.3	51.8
Repayment of Notes Receivable from Related Parties	0.0	0.0	40.0	0.0
Net Cash Provided by (Used in) Investing Activities, Total	21.4	(25.1)	(16.7)	(42.0)
FINANCING ACTIVITIES
Payments of Financing Costs	0.0	0.0	3.9	0.0
Payment, Tax Withholding, Share-Based Payment Arrangement	0.0	0.0	2.5	0.0
Proceeds from issuance of senior notes	520.0	0.0	0.0	0.0
Payments To Predecessor Creditors	(129.9)	0.0	0.0	0.0
Proceeds from Lines of Credit	0.0	0.0	0.0	596.0
Payments for Debtor-in-possession financing fees and backstop agreement	0.0	0.0	0.0	(40.0)
Repayments of Lines of Credit	0.0	0.0	0.0	(15.0)
Reduction of long-term borrowings	0.0	0.0	0.0	(9.7)
Payments to Noncontrolling Interests	0.0	0.0	0.0	(7.2)
Other	(1.4)	0.0	0.0	(1.9)
Net cash provided by (used in) financing activities	388.7	0.0	(6.4)	522.2
Effect of exchange rate changes on cash and cash equivalents	(0.1)	(0.1)	(0.5)	0.1
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	370.2	(51.4)	103.9	228.6
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	696.0	644.6	748.5	325.8
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	$ (696.0)	$ (644.6)	$ (748.5)	$ (325.8)

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