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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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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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