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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Goodwill |  |  |  |
Deferred Income Tax Expense (Benefit) |  | $ (26.8) | $ (4.3) |
Deferred Tax Assets, Valuation Allowance | $ 29.6 | 34.2 |  |
U.S. Dealer-to-Dealer |  |  |  |
Goodwill |  |  |  |
Deferred Income Tax Expense (Benefit) | $ (52.5) |  |  |
Marketplace |  |  |  |
Goodwill |  |  |  |
Accumulated goodwill impairment |  | 250.8 |  | $ 25.5
Finance |  |  |  |
Goodwill |  |  |  |
Accumulated goodwill impairment |  | $ 161.5 |  | $ 161.5

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