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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023
Changes in goodwill
Balance at the beginning of the year	$ 1,464.5	$ 1,464.5
Impairment		(225.3)
Foreign currency		(1.4)
Balance at the end of the year		1,237.8
U.S. Dealer-to-Dealer
Changes in goodwill
Impairment	(218.9)
Balance at the end of the year		87.3
Europe
Changes in goodwill
Impairment	(6.4)
Balance at the end of the year		115.7
Marketplace
Changes in goodwill
Balance at the beginning of the year	1,223.6	1,223.6
Impairment		(225.3)
Foreign currency		(1.4)
Balance at the end of the year		996.9
Finance
Changes in goodwill
Balance at the beginning of the year	$ 240.9	240.9
Impairment		0.0
Foreign currency		0.0
Balance at the end of the year		$ 240.9

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