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Debt (Narrative) (Details) - USD ($)		4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020	Sep. 25, 2020
Extinguishment of Debt [Line Items]
Backstop Commitment Fees		$ 0	$ 0	$ 0	$ 447,900,000
Backstop Commitment Agreement, Backstop Premium		(30,000,000.0)	0	0	0
BackstopCommitmentAgreementSharesToBeAllocated	2.70%
BackstopCommitmentAgreementCashSettlement	$ 520,000,000	520,000,000
BackstopCommitmentAgreementNoteIssued	550,000,000	550,000,000
Debtor-in-Possession Financing, Amount Arranged						$ 500,000,000
Liabilities Subject To Compromise, Accrued Interest On Notes			201,900,000		203,500,000
Liabilities Subject to Compromise	0	0			7,313,700,000
Long-term Debt	544,800,000	544,800,000
Maximum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Restricted Cash	175,000,000	175,000,000
Minimum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Restricted Cash	100,000,000	100,000,000
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Backstop Commitment Agreement, Backstop Premium	50,000,000
BackstopCommitmentAgreementCommitmentFee	20,000,000	20,000,000
Senior Notes [Member] | Reported Value Measurement [Member]
Extinguishment of Debt [Line Items]
Liabilities Subject to Compromise			$ 6,500,000,000
First Lien Notes | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount	$ 550,000,000	$ 550,000,000
DebtInstrumentPercentSecuredEquityInterest	100.00%
DebtInstrumentInterestRateAnnualPaymentPercent	10.25%
DebtInstrumentAllowableRedemptionPercentPriorToMaturity	35.00%	35.00%
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	104.00%
DebtInstrumentPercentOfNoteRemainingOutstanding	65.00%
DebtInstrumentRedemptionPeriodTiming	12000.00%
Debt Instrument, Consent Solicitation Costs				$ 3,900,000
Debtor-in-Possession Financing, Amount Arranged	$ 520,000,000	$ 520,000,000
First Lien Notes | Senior Notes [Member] | Maximum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Investment Maximum	$ 175,000,000	$ 175,000,000
Debt Instrument, Covenant, Investment Maximum, Percent Of Total Assets	6.50%	6.50%
First Lien Notes | Senior Notes [Member] | Minimum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Investment Maximum	$ 100,000,000	$ 100,000,000
Debt Instrument, Covenant, Investment Maximum, Percent Of Total Assets	4.00%	4.00%
First Lien Notes | Senior Notes [Member] | Debt Instrument, Redemption, Period One
Extinguishment of Debt [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	104.00%
First Lien Notes | Senior Notes [Member] | Debt Instrument, Redemption, Period One | Maximum
Extinguishment of Debt [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	104.00%
First Lien Notes | Senior Notes [Member] | Debt Instrument, Redemption, Period Three
Extinguishment of Debt [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	101.00%
First Lien Notes | Senior Notes [Member] | Debt Instrument, Redemption, Period Three | Minimum
Extinguishment of Debt [Line Items]
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering	100.00%
First Lien Notes | Senior Notes [Member] | Debt Instrument Interest Rate Payout Option One Member
Extinguishment of Debt [Line Items]
DebtInstrumentInterestRateAnnualPaymentPercent	8.25%
First Lien Notes | Senior Notes [Member] | Debt Instrument Interest Rate Payout Option Two Member
Extinguishment of Debt [Line Items]
DebtInstrumentAnnualInterestPayoutPercentInCash	50.00%
DebtInstrumentAnnualInterestPayoutPercentPaidInKind	50.00%
DebtInstrumentInterestRateAnnualPaymentPercentPaidInKind	12.00%
Line of Credit [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Extinguishment of Debt [Line Items]
Long-term Debt					$ 581,000,000
Reorganization, Chapter 11, Plan Effect Adjustment
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount	$ 550,000,000	$ 550,000,000
Debt Issuance Costs, Net	(5,200,000)	(5,200,000)
Liabilities Subject to Compromise	(7,313,700,000)	(7,313,700,000)
Long-term Debt	$ 544,800,000	$ 544,800,000

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Face (par) amount of debt instrument at time of issuance.

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