Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,019.8	$ 411.5	$ 2,638.7	$ 1,289.9
Total service revenue
Disaggregation of Revenue [Line Items]
Revenue	773.8	246.7	1,923.4	778.0
Commissions
Disaggregation of Revenue [Line Items]
Revenue	211.0	108.2	574.8	361.0
Buyer fees
Disaggregation of Revenue [Line Items]
Revenue	457.6	74.5	1,062.2	237.1
Marketplace services revenue
Disaggregation of Revenue [Line Items]
Revenue	105.2	64.0	286.4	179.9
Inventory sales revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 246.0	$ 164.8	$ 715.3	$ 511.9