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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,186.0	$ 1,096.1	$ 2,294.6	$ 2,160.8
Total service revenue
Disaggregation of Revenue [Line Items]
Revenue	887.2	859.1	1,739.7	1,708.2
Transactional seller revenue
Disaggregation of Revenue [Line Items]
Revenue	241.0	250.7	457.8	489.3
Transactional buyer revenue
Disaggregation of Revenue [Line Items]
Revenue	560.6	510.0	1,117.3	1,035.4
Marketplace services revenue
Disaggregation of Revenue [Line Items]
Revenue	85.6	98.4	164.6	183.5
Inventory sales revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 298.8	$ 237.0	$ 554.9	$ 452.6

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