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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Changes in Goodwill |  |  |  |
Balance at the beginning of the year |  | $ 1,271.2 |  |
Foreign currency |  | (1.3) |  |
Balance at the end of the year |  | 1,269.9 |  |
Deferred income tax expense (benefit) |  | (0.1) | $ (26.8) |
Impairment of goodwill |  | 0.0 |  |
U.S. Dealer-to-Dealer |  |  |  |
Changes in Goodwill |  |  |  |
Impairment of goodwill | $ 218.9 |  |  |
Europe |  |  |  |
Changes in Goodwill |  |  |  |
Impairment of goodwill | 6.4 |  |  |
Domestic Tax Jurisdiction |  |  |  |
Changes in Goodwill |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 42.9 |  | $ 36.4
Goodwill |  |  |  |
Changes in Goodwill |  |  |  |
Deferred income tax expense (benefit) | (52.5) |  |  |
ADESA Trade Names (Indefinite) |  |  |  |
Changes in Goodwill |  |  |  |
Deferred income tax expense (benefit) | (6.5) |  |  |
ADESA tradename - non-cash impairment charge | $ 25.5 |  |  |
Marketplace |  |  |  |
Changes in Goodwill |  |  |  |
Balance at the beginning of the year |  | 1,030.3 |  |
Foreign currency |  | (1.3) |  |
Balance at the end of the year |  | 1,029.0 |  |
Accumulated goodwill impairment |  | 250.8 |  | 250.8
Finance |  |  |  |
Changes in Goodwill |  |  |  |
Balance at the beginning of the year |  | 240.9 |  |
Foreign currency |  | 0.0 |  |
Balance at the end of the year |  | 240.9 |  |
Accumulated goodwill impairment |  | $ 161.5 |  | $ 161.5

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