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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,108.6	$ 1,064.7
Total service revenue
Disaggregation of Revenue [Line Items]
Revenue	852.5	849.1
Transactional seller revenue
Disaggregation of Revenue [Line Items]
Revenue	216.8	238.6
Transactional buyer revenue
Disaggregation of Revenue [Line Items]
Revenue	556.7	525.4
Marketplace services revenue
Disaggregation of Revenue [Line Items]
Revenue	79.0	85.1
Inventory sales revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 256.1	$ 215.6

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