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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |  |
Maximum exposure associated with general indemnifications |  | $ 42.0 | $ 46.5
General indemnifications minimum expiration period | 1 year |  |
General indemnifications maximum expiration period | 3 years |  |
Percentage of dealership that is accounted for under the equity method |  | 50.00% |
Contingent liability reserve balance after reduction |  | $ 4.3 |
Other accrued liabilities |  |  |
Other Commitments [Line Items] |  |  |
Amount reserved for pending proceedings |  | 0.3 | 1.2
Other long-term liabilities |  |  |
Other Commitments [Line Items] |  |  |
Amount reserved for pending proceedings |  | $ 0.2 | $ 0.3

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