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Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill impairment | $ 0 |  |
Franchise rights impairment | 9,600,000 | $ 8,100,000 | $ 0
Franchise Rights [Member] | Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Franchise rights impairment | 9,600,000 | 8,100,000 | $ 0
Reported Value Measurement [Member] | Continuing Operations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale | 40,600,000 | 67,800,000 |
Reported Value Measurement [Member] | Discontinued Operations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held for sale in discontinued operations | $ 8,000,000.0 | $ 14,100,000 |

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