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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in goodwill |  |  |  |  |
Balance at the beginning of the year |  | $ 1,464.5 | $ 1,464.5 | $ 1,598.0 |
Decrease for disposition activity |  |  |  | (119.2) |
Foreign currency |  |  | 6.1 | (14.3) |
Increase for acquisition activity |  |  | 25.9 |  |
Impairment | $ 0.0 |  | (225.3) | 0.0 |
Balance at the end of the year |  |  | 1,271.2 | 1,464.5 | $ 1,598.0
Deferred income tax expense (benefit) |  |  | (29.8) | (2.3) | 4.4
Deferred Tax Assets, Valuation Allowance |  |  | 63.2 | 25.3 |
Domestic Tax Authority |  |  |  |  |
Changes in goodwill |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | 36.4 |  |
ADESA Trade Names (Indefinite) |  |  |  |  |
Changes in goodwill |  |  |  |  |
Deferred income tax expense (benefit) |  | (6.5) |  |  |
ADESA U.S. physical auctions |  |  |  |  |
Changes in goodwill |  |  |  |  |
Decrease for disposition activity |  |  |  | (1,100.0) |
U.S. Dealer-to-Dealer |  |  |  |  |
Changes in goodwill |  |  |  |  |
Impairment |  | (218.9) |  |  |
Balance at the end of the year |  |  | 87.3 |  |
Deferred income tax expense (benefit) |  | (52.5) |  |  |
Europe Reporting Unit |  |  |  |  |
Changes in goodwill |  |  |  |  |
Impairment |  | (6.4) |  |  |
Balance at the end of the year |  |  | 120.8 |  |
Marketplace |  |  |  |  |
Changes in goodwill |  |  |  |  |
Balance at the beginning of the year |  | 1,223.6 | 1,223.6 | 1,357.1 |
Decrease for disposition activity |  |  |  | (119.2) |
Foreign currency |  |  | 6.1 | (14.3) |
Increase for acquisition activity |  |  | 25.9 |  |
Impairment |  |  | (225.3) |  |
Balance at the end of the year |  |  | 1,030.3 | 1,223.6 | 1,357.1
Accumulated Goodwill Impairment |  |  | 250.8 | 25.5 | 25.5
Finance |  |  |  |  |
Changes in goodwill |  |  |  |  |
Balance at the beginning of the year |  | $ 240.9 | 240.9 | 240.9 |
Decrease for disposition activity |  |  |  | 0.0 |
Foreign currency |  |  | 0.0 | 0.0 |
Increase for acquisition activity |  |  | 0.0 |  |
Impairment |  |  | 0.0 |  |
Balance at the end of the year |  |  | 240.9 | 240.9 | 240.9
Accumulated Goodwill Impairment |  |  | $ 161.5 | $ 161.5 | $ 161.5

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