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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Franchise rights impairment | $ 0.0 | $ 0.0 | $ 9.6 | $ 8.1 |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on franchise rights and other |  |  | (9.9) | (8.1) |
Gain/(Loss) on right-of-use assets |  |  | (0.2) | 0.0 |
Gain/(Loss) on assets held and used |  |  | (0.1) | (1.6) |
Gain/(Loss) on assets held for sale |  |  | (2.1) | (0.6) |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Franchise rights and other | 8.9 | 31.7 | 8.9 | 31.7 |
Right-of-use assets | 0.1 | 0.0 | 0.1 | 0.0 |
Long-lived assets held and used | 0.0 | 0.0 | 0.0 | 0.0 |
Assets held for sale | 31.5 | 7.4 | 31.5 | 7.4 |
Continuing Operations [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on assets held for sale |  |  | (1.6) | (0.6) |
Continuing Operations [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets held for sale | 26.1 | 7.4 | 26.1 | 7.4 |
Discontinued Operations [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on assets held for sale |  |  | (0.5) | 0.0 |
Discontinued Operations [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets held for sale | 5.4 | 0.0 | 5.4 | 0.0 |
Reported Value Measurement [Member] | Continuing Operations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets held for sale | 114.2 |  | 114.2 |  | $ 67.8
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 | 13.3 |  | 13.3 |  | $ 14.1
Franchise Rights [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Franchise rights impairment | $ 0.0 | $ 0.0 | $ 9.6 | $ 8.1 |

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