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

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Debt (Narrative) (Details) - USD ($)						4 Months Ended	8 Months Ended	12 Months Ended
Debt (Narrative) (Details) - USD ($)	Aug. 21, 2023	May 03, 2023	Apr. 19, 2023	Apr. 03, 2023	Apr. 30, 2021	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Extinguishment of Debt [Line Items]
Repayments of Long-term Debt						$ 0	$ 0	$ 571,800,000	$ 0
Loss on extinguishment of debt						0	$ 0	29,200,000	0
Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 375,000,000
Line of Credit Facility, Additional Borrowing Capacity				200,000,000
Line of Credit Facility, Fair Value of Amount Outstanding								$ 0
Revolving Credit Facility [Member] \| Letter of Credit
Extinguishment of Debt [Line Items]
Line of Credit Facility, Additional Borrowing Capacity				$ 150,000,000
Federal Fund Rate Plus One Half Member \| Revolving Credit Facility [Member] \| Federal Funds Rate
Extinguishment of Debt [Line Items]
Basis spread on variable rate				0.50%
Maximum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Restricted Cash					$ 175,000,000	175,000,000
Maximum \| Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Line of Credit Facility, Commitment Fee Percentage				0.75%
Maximum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Standards & Poor's Financial Services LLC
Extinguishment of Debt [Line Items]
Basis spread on variable rate				3.00%
Maximum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Moody's Investors Service, Inc.
Extinguishment of Debt [Line Items]
Basis spread on variable rate				4.00%
Maximum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR)
Extinguishment of Debt [Line Items]
Basis spread on variable rate				0.10%
Maximum \| Term SOFR Plus One and One Tenth Member \| Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR)
Extinguishment of Debt [Line Items]
Basis spread on variable rate				1.10%
Minimum
Extinguishment of Debt [Line Items]
Debt Instrument, Covenant, Restricted Cash					100,000,000	100,000,000
Minimum \| Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Line of Credit Facility, Commitment Fee Percentage				0.375%
Minimum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Standards & Poor's Financial Services LLC
Extinguishment of Debt [Line Items]
Basis spread on variable rate				1.50%
Minimum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Moody's Investors Service, Inc.
Extinguishment of Debt [Line Items]
Basis spread on variable rate				2.50%
Minimum \| Term SOFR Plus One Tenth Member \| Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR)
Extinguishment of Debt [Line Items]
Basis spread on variable rate				0.00%
Minimum \| Floor for Term SOFR and One and One Tenth Member \| Revolving Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR)
Extinguishment of Debt [Line Items]
Basis spread on variable rate				1.00%
First Lien Notes \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount					$ 550,000,000	550,000,000
DebtInstrumentInterestRateAnnualPaymentPercent					10.25%
DebtInstrumentRedemptionPricePercentOfNetCashProceedsFromEquityOffering					104.00%
Debt Instrument, Consent Solicitation Costs									$ 3,900,000
Repayments of Long-term Debt		$ 571,800,000
Loss on extinguishment of debt		$ 29,200,000
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					5000.00%
DebtInstrumentAnnualInterestPayoutPercentPaidInKind					50.00%
DebtInstrumentInterestRateAnnualPaymentPercentPaidInKind					12.00%
Senior Notes [Member] \| First Lien Notes \| 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%
Senior Notes [Member] \| First Lien Notes \| 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%
Initial Second Lien Notes \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount			$ 700,000,000
Proceeds from Issuance of Debt			$ 681,400,000
Debt Instrument, Triggering Event, Redemption Price Percentage				101.00%
Initial Second Lien Notes \| Senior Notes [Member] \| Debt Instrument Principle Percentage Redemption, Three
Extinguishment of Debt [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Additional Second Lien Notes \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Face Amount	$ 400,000,000
Proceeds from Issuance of Debt	$ 396,900,000
Debt Instrument, Issued, Percentage of Par	100.75%
Debt Instrument, Increase, Accrued Interest	$ 11,400,000
Second Lien Notes \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage			837.50%
Debt Instrument, Interest Rate, Effective Percentage			8.76%
Second Lien Notes \| Senior Notes [Member] \| Federal Fund Rate Plus One Half Member
Extinguishment of Debt [Line Items]
Principle redemption			40.00%
Debt Instrument, Redemption Price, Percentage			108.375%
Second Lien Notes \| Senior Notes [Member] \| Term SOFR Plus One Tenth Member
Extinguishment of Debt [Line Items]
Principle redemption			10.00%
Debt Instrument, Redemption Price, Percentage			103.00%
Second Lien Notes \| Senior Notes [Member] \| Debt Instrument, Redemption, Period One
Extinguishment of Debt [Line Items]
Debt Instrument, Redemption Price, Percentage			104.188%
Second Lien Notes \| Senior Notes [Member] \| Debt Instrument, Redemption, Period Three
Extinguishment of Debt [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
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)
Proceeds from Issuance of Debt					$ 500,000,000.0