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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment | $ 56,700,000 |  | $ 56,700,000
Continuing Operations | Reported Value Measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale | 59,100,000 |  | 53,300,000
Discontinued Operations | Reported Value Measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale in discontinued operations | 1,100,000 |  | $ 1,100,000
Franchise Rights |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Franchise rights impairment | 0 | $ 0 |
Nonrecurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gain/(Loss) on equity investment | 0 | 3,400,000 |
Gain/(Loss) on right-of-use assets | 0 | (100,000) |
Gain/(Loss) on assets held and used | (1,000,000.0) | (1,600,000) |
Nonrecurring Basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity investment | 0 | 53,400,000 |
Right-of-use assets | 0 | 0 |
Long-lived assets held and used | $ 0 | $ 10,400,000 |

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