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Financial Instruments and Fair Value Measurements (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 store | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  | $ 0 | $ 318,300,000 | $ 0
Franchise rights impairment |  |  |  | 0 | 57,500,000 | 9,600,000
Franchise rights impairment, number of stores | store | 8 |  |  |  |  |
Reporting Unit, Premium Luxury [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 257,400,000 |
Reporting Unit, Collision Centers [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  |  |  | 41,600,000 |
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] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill impairment |  |  | $ 318,300,000 | 0 | 318,300,000 |
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] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise rights |  |  |  | 0 | 26,200,000 |
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 |  | $ 0 | 57,500,000 | 0 |  | $ 9,600,000
Franchise Rights [Member] | Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise rights |  |  | $ 24,600,000 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.020 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Arithmetic Average [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.085 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Arithmetic Average [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.121 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Arithmetic Average [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.014 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Arithmetic Average [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Contributory Asset Charges [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.062 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.111 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.006 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Contributory Asset Charges [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.042 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.143 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Long-term Pretax Income Margin [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.028 |  |  |
Franchise Rights [Member] | Nonrecurring [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Contributory Asset Charges [Member] | Valuation Technique, Discounted Cash Flow [Member] |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |  |  |  |  |
Franchise Rights, Measurement Input |  |  | 0.121 |  |  |
Reported Value Measurement [Member] | Continuing Operations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets held for sale |  |  |  | 53,300,000 | 25,500,000 |
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 | $ 8,000,000 |

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