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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain/(Loss) on Equity Investment |  | $ 25,700,000 | $ 0 | $ 0
Gain/(Loss) on assets held for sale | $ (26,200,000) |  |  |
Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain/(loss) on Franchise rights and other |  | (9,900,000) | (8,100,000) |
Gain/(Loss) on Equity Investment |  | 25,700,000 | 0 |
Gain/(Loss) on Right-of-use assets |  | (200,000) | 0 |
Gain/(Loss) on assets held for sale |  | (2,100,000) | (600,000) |
Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Franchise rights |  | 8,900,000 | 31,700,000 |
Equity investment |  | 75,700,000 | 0 |
Right of Use Asset |  | 100,000 | 0 |
Long-lived assets held for sale |  | 31,500,000 | 7,400,000 |
Continuing Operations [Member] | Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain/(Loss) on assets long-lived assets held and used |  | (100,000) | (2,600,000) |
Gain/(Loss) on assets held for sale |  | (1,600,000) | (600,000) |
Continuing Operations [Member] | Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets held and used |  | 0 | 0 |
Long-lived assets held for sale |  | 26,100,000 | 7,400,000 |
Discontinued Operations [Member] | Nonrecurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain/(Loss) on assets held for sale |  | (500,000) | 0 |
Discontinued Operations [Member] | Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-lived assets held for sale |  | $ 5,400,000 | $ 0 |

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