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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Apr. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt			$ 544.8
LONG-TERM NOTES RECEIVABLE FROM ARO	$ 282.3	$ 254.0	$ 228.3
Senior Secured Second Lien Notes | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt instrument interest rate stated percentage	8.375%
Reported Value Measurement [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	$ 282.3	254.0
Reported Value Measurement [Member] | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	1,079.3	542.4
Reported Value Measurement [Member] | Senior Secured Second Lien Notes | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	1,079.3	0.0
Reported Value Measurement [Member] | Senior Secured First Lien Notes | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	0.0	542.4
Estimate of Fair Value Measurement [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	423.5	336.7
Estimate of Fair Value Measurement [Member] | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	1,126.1	545.9
Estimate of Fair Value Measurement [Member] | Senior Secured Second Lien Notes | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	1,126.1	0.0
Estimate of Fair Value Measurement [Member] | Senior Secured First Lien Notes | Senior Notes [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term Debt	$ 0.0	$ 545.9

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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