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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Reported Value Measurement [Member] | Eight Point Two Five Percent Senior Lien Notes Due Two Thousand Twenty Eight Member | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-Term Debt	$ 545.7	$ 545.3
Estimate of Fair Value Measurement [Member] | Notes Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	293.1
Estimate of Fair Value Measurement [Member] | Eight Point Two Five Percent Senior Lien Notes Due Two Thousand Twenty Eight Member | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	$ 534.6	$ 575.7

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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