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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Segments |  |  |
Number of operating segments | segment | 2 |  |
Number of reportable segments | segment | 2 |  |
Foreign Currency Translation |  |  |
Foreign currency transaction gain (loss) on intercompany balances | $ 2.9 | $ (2.5) | $ (3.8)
Accounts Payable |  |  |
Book overdrafts | $ 17.9 | 20.2 |
Income Taxes |  |  |
Recognized income tax positions measured at largest amount greater than specified percentage being realized | 50.00% |  |
Operating revenues |  |  |
Provision for credit losses | $ 50.6 | 9.8 | 3.5
Finance-related revenue | $ 393.4 | 375.9 | 289.2
Purchased vehicles sold as a percentage of total vehicles sold | 1.00% |  |
AFC |  |  |
Operating revenues |  |  |
Interest income | $ 248.4 | 202.8 | 139.7
Fee income | 183.3 | 171.9 | 144.4
Other revenue | 12.3 | 11.0 | 8.6
Provision for credit losses | 50.6 | 9.8 | 3.5
Finance-related revenue | $ 393.4 | $ 375.9 | $ 289.2
Floorplan receivables | Minimum |  |  |
Receivables |  |  |
Predetermined time period for financing receivables to become due | 30 days |  |
Floorplan receivables | Maximum |  |  |
Receivables |  |  |
Predetermined time period for financing receivables to become due | 90 days |  |
AFC Funding Corporation | Minimum |  |  |
Restricted Cash |  |  |
Cash reserve as security for the receivables sold (as a percent) | 1.00% |  |
Cash reserve as security for the receivables sold - circumstance two (as a percent) | 3.00% |  |
AFCI | Minimum |  |  |
Restricted Cash |  |  |
Cash reserve as security for the receivables sold (as a percent) | 1.00% |  |
Cash reserve as security for the receivables sold - circumstance two (as a percent) | 3.00% |  |

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