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Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue	$ 1,106.5	$ 484.5	$ 1,618.9	$ 878.5
Service revenue
Revenue	806.1	286.5	1,149.6	531.4
Commissions
Revenue	233.3	136.4	363.8	252.8
Buyer fees
Revenue	465.1	87.0	604.6	162.6
Marketplace services revenue
Revenue	107.7	63.1	181.2	116.0
Inventory sales revenue
Revenue	$ 300.4	$ 198.0	$ 469.3	$ 347.1

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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