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Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on franchise rights | $ (8.1) | $ 0.0 | $ (8.1) | $ 0.0 |
Franchise rights impairment | 8.1 | 0.0 | 8.1 | 0.0 |
Continuing Operations [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on assets held and used |  |  | (1.0) | 0.0 |
Gain/(Loss) on assets held for sale, continuing operations |  |  | (0.6) | 0.2 |
Continuing Operations [Member] | Fair Value, Measurements, 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 | 0.0 | 0.0 | 0.0 |
Long-lived assets held for sale in continuing operations | 7.4 | 2.9 | 7.4 | 2.9 |
Reported Value Measurement [Member] | Continuing Operations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets held for sale | 83.3 |  | 83.3 |  | $ 169.1
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 | 14.5 |  | 14.5 |  | $ 14.4
Franchise Rights [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on franchise rights |  |  | (8.1) | 0.0 |
Franchise rights impairment |  |  | 8.1 | 0.0 |
Franchise Rights [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Franchise rights | $ 31.7 | $ 0.0 | $ 31.7 | $ 0.0 |

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