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Financial Instruments and Fair Value Measurements (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) store | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment |  |  | $ 0 | $ 0 | $ 318,300,000
Franchise rights impairment |  |  | $ 0 | $ 0 | $ 57,500,000
Franchise rights impairment, number of stores | store | 8 |  |  |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Other Operating Income (Expense), Net
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net | Other Operating Income (Expense), Net
Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment | $ 318,300,000 |  |  |  |
Impairment of right-of-use assets |  |  | $ 0 | $ 100,000 | $ 3,100,000
Nonrecurring [Member] | Reporting Unit, Premium Luxury [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment | 257,400,000 |  |  |  |
Nonrecurring [Member] | Reporting Unit, Collision Centers [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment | 41,600,000 |  |  |  |
Nonrecurring [Member] | Reporting Unit, Parts Centers [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment | 19,300,000 |  |  |  |
Nonrecurring [Member] | Other Intangible Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of finite lived intangible assets |  |  |  |  | 2,400,000
Franchise Rights [Member] | Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Franchise rights impairment | $ 57,500,000 | $ 0 | 0 |  |
Continuing Operations [Member] | Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of assets held and used |  |  | 1,600,000 | 3,100,000 | $ 9,200,000
Reported Value Measurement [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Repossessed assets |  |  | 2,700,000 |  |
Reported Value Measurement [Member] | Continuing Operations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets held for sale |  |  | 5,700,000 | 53,300,000 |
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 |  |  | $ 1,100,000 | $ 1,100,000 |

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