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Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | $ 285.4 | $ 198.1
Auto loans receivable, Originated in year before current year | 84.6 | 97.8
Auto loans receivable, Originated two years before current year | 51.7 | 39.7
Auto loans receivable, Originated three years before current year | 17.3 | 31.5
Auto loans receivable, Originated four years before current year | 10.6 | 9.0
Auto loans receivable, Originated five years or more before current year | 1.6 | 0.9
Total auto loans receivable | 451.2 | 377.0
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |
Current-period gross write-offs, 2023 origination | 10.5 |
Current-period gross write-offs, 2022 origination | 33.6 |
Current-period gross write-offs, 2021 origination | 16.4 |
Current-period gross write-offs, 2020 origination | 4.6 |
Current-period gross write-offs, 2019 origination | 2.5 |
Current-period gross write-offs, Prior to 2019 origination | 0.7 |
Current-period gross write-offs | 68.3 | 13.9
Platinum |  |
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | 163.9 | 21.9
Auto loans receivable, Originated in year before current year | 14.8 | 12.9
Auto loans receivable, Originated two years before current year | 8.2 | 6.4
Auto loans receivable, Originated three years before current year | 3.3 | 7.4
Auto loans receivable, Originated four years before current year | 3.1 | 2.2
Auto loans receivable, Originated five years or more before current year | 0.5 | 0.2
Total auto loans receivable | 193.8 | 51.0
Gold |  |
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | 64.3 | 53.7
Auto loans receivable, Originated in year before current year | 35.9 | 30.0
Auto loans receivable, Originated two years before current year | 18.5 | 12.9
Auto loans receivable, Originated three years before current year | 6.8 | 10.6
Auto loans receivable, Originated four years before current year | 4.5 | 3.2
Auto loans receivable, Originated five years or more before current year | 0.8 | 0.4
Total auto loans receivable | 130.8 | 110.8
Silver |  |
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | 50.2 | 61.9
Auto loans receivable, Originated in year before current year | 33.0 | 29.8
Auto loans receivable, Originated two years before current year | 16.2 | 10.4
Auto loans receivable, Originated three years before current year | 5.2 | 8.0
Auto loans receivable, Originated four years before current year | 2.8 | 1.9
Auto loans receivable, Originated five years or more before current year | 0.3 | 0.1
Total auto loans receivable | 107.7 | 112.1
Bronze |  |
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | 6.7 | 41.4
Auto loans receivable, Originated in year before current year | 0.7 | 17.1
Auto loans receivable, Originated two years before current year | 6.0 | 7.4
Auto loans receivable, Originated three years before current year | 1.5 | 3.7
Auto loans receivable, Originated four years before current year | 0.1 | 1.0
Auto loans receivable, Originated five years or more before current year | 0.0 | 0.1
Total auto loans receivable | 15.0 | 70.7
Copper |  |
Auto Loans Receivable |  |
Auto loans receivable, Originated in current year | 0.3 | 19.2
Auto loans receivable, Originated in year before current year | 0.2 | 8.0
Auto loans receivable, Originated two years before current year | 2.8 | 2.6
Auto loans receivable, Originated three years before current year | 0.5 | 1.8
Auto loans receivable, Originated four years before current year | 0.1 | 0.7
Auto loans receivable, Originated five years or more before current year | 0.0 | 0.1
Total auto loans receivable | $ 3.9 | $ 32.4

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