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Derivative Financial Instruments - Narrative (Details) $ in Millions | Jun. 15, 2021 USD ($) derivative | Oct. 02, 2020 USD ($) derivative | Jun. 01, 2019 USD ($) | Sep. 30, 2021 USD ($) derivative | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Non-trade floor plan notes payable |  |  |  | $ 688.9 | $ 1,563.0
Amount of net losses expected to reclassify from AOCI into interest expense in earnings within the next twelve months |  |  |  | $ 2.7 |
Interest Rate Cap | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments entered during period | derivative | 2 | 2 |  |  |
Number of derivative instruments held | derivative |  |  |  | 4 |
Interest Rate Contract |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Agreement term |  |  | 5 years |  |
Aggregate notional amount |  |  | $ 300.0 |  |
Non-trade floor plan notes payable |  |  | $ 688.2 |  |
Interest Rate Contract | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Agreement term | 5 years | 5 years |  |  |
Aggregate notional amount | $ 100.0 | $ 100.0 |  |  |
Derivative liability |  |  |  | $ 4.2 |
Derivative asset |  |  |  | $ 4.2 |

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