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Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 3,679.6	$ 1,733.8	$ 1,417.0
Total service revenue
Disaggregation of Revenue [Line Items]
Revenues	2,732.5	1,050.6	917.8
Commissions
Disaggregation of Revenue [Line Items]
Revenues	812.4	490.6	473.4
Buyer fees
Disaggregation of Revenue [Line Items]
Revenues	1,526.7	315.8	248.7
Marketplace services revenue
Disaggregation of Revenue [Line Items]
Revenues	393.4	244.2	195.7
Inventory sales revenue
Disaggregation of Revenue [Line Items]
Revenues	$ 947.1	$ 683.2	$ 499.2

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