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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) RM in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Rate	Dec. 31, 2024 MYR (RM)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	$ 296.2		$ 282.3
Interest Costs Capitalized	15.9		5.6	$ 1.2
Accounts payable - trade	328.5		400.1
Increase (Decrease) in Other Receivable Principal Amount \| RM		RM 26.1
Paid-in-Kind Interest \| RM		RM 24.6
ARO
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	296.2		282.3
Accounts payable - trade	$ 43.1		57.7
ARO \| Net Settlement Agreement
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accounts payable - trade					$ 50.7
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 \| Rate	8.375%
Reported Value Measurement [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	$ 296.2		282.3
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	1,082.7		1,079.3
Estimate of Fair Value Measurement [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
LONG-TERM NOTES RECEIVABLE FROM ARO	378.3		423.5
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	$ 1,112.7		$ 1,126.1