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Credit Facilities and Long-term Debt - Schedule of Credit Facilities and Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Oct. 09, 2020 | Dec. 31, 2019 | Dec. 09, 2019 | Jul. 24, 2017
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Floor plan notes payable: non-trade | $ 1,563.0 |  | $ 1,642.4 |  |
Floor plan notes payable | 234.2 |  | 425.2 |  |
Total floor plan debt | 1,797.2 |  | 2,067.6 |  |
Finance lease obligations | 246.4 |  | 30.5 |  |
Total long-term debt outstanding | 2,149.3 |  | 1,480.3 |  |
Less: unamortized debt issuance costs | (18.6) |  | (10.4) |  |
Less: current maturities (net of current debt issuance costs) | (66.0) |  | (39.3) |  |
Long-term debt, less current maturities | 2,064.7 |  | 1,430.6 |  |
Line of Credit | Used vehicle inventory financing facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 0.0 |  | 149.0 |  |
Line of Credit | Revolving lines of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 39.0 |  | 0.0 |  |
Real estate mortgages |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 611.5 |  | 597.7 |  |
Other debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 2.4 |  | 3.1 |  |
5.250% Senior notes due 2025 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 300.0 |  | 300.0 |  |
Interest rate, stated percentage |  |  |  |  | 5.25%
4.625% Senior notes due 2027 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 400.0 |  | 400.0 |  |
Interest rate, stated percentage |  |  |  | 4.625% |
4.375% Senior notes due 2031 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 550.0 |  | $ 0.0 |  |
Interest rate, stated percentage |  | 4.375% |  |  |

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- Definition Amounts borrowed to finance the purchase of specific new and program vehicle inventories with lenders that are not captive finance subsidiaries of the manufacturer. + References No definition available. + Details
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