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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
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on goodwill impairment |  |  | $ 0 | $ (318,300,000) | $ 0
Equity investment |  |  | 56,700,000 | 50,000,000 |
Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain/(Loss) on goodwill impairment |  | $ (318,300,000) | 0 | (318,300,000) |
Gain/(loss) on franchise rights and other |  |  | 0 | (59,900,000) |
Gain/(Loss) on equity investment | $ 3,400,000 |  |  | 0 |
Gain/(loss) on right-of-use assets |  |  | (100,000) | (3,100,000) |
Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill |  |  | 0 | 457,500,000 |
Franchise rights and other |  |  | 0 | 26,200,000 |
Equity investment |  |  | 53,400,000 | 0 |
Right of Use Asset |  |  | 0 | 5,000,000.0 |
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 |  |  | (3,100,000) | (9,200,000) |
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 |  |  | $ 10,400,000 | $ 1,800,000 |

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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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