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Goodwill And Intangible Assets, Net (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) store | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | $ 0.0 |  | $ 0.0 | $ 318.3 | $ 0.0
Franchise rights impairment, number of stores | store |  | 8 |  |  |
Franchise rights impairment | 0.0 |  | $ 9.6 | 57.5 | 9.6
Reporting Unit, Premium Luxury [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  |  | 257.4 |
Reporting Unit, Collision Centers [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  |  | 41.6 |
Reporting Unit, Parts Centers [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  |  | $ 19.3 |
Fair Value, Nonrecurring [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | $ 318.3 |  |  | 0.0
Fair Value, Nonrecurring [Member] | Reporting Unit, Premium Luxury [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | 257.4 |  |  |
Fair Value, Nonrecurring [Member] | Reporting Unit, Collision Centers [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | 41.6 |  |  |
Fair Value, Nonrecurring [Member] | Reporting Unit, Parts Centers [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | 19.3 |  |  |
Fair Value, Nonrecurring [Member] | Franchise Rights [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Franchise rights impairment | $ 0.0 | $ 57.5 |  |  | $ 9.6

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