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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,092.7	$ 981.8	$ 3,387.3	$ 3,142.6
Total service revenue
Disaggregation of Revenue [Line Items]
Revenue	845.0	779.9	2,584.7	2,488.1
Transactional seller revenue
Disaggregation of Revenue [Line Items]
Revenue	215.8	206.6	673.6	695.9
Transactional buyer revenue
Disaggregation of Revenue [Line Items]
Revenue	543.8	486.9	1,661.1	1,522.3
Marketplace services revenue
Disaggregation of Revenue [Line Items]
Revenue	85.4	86.4	250.0	269.9
Inventory sales revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 247.7	$ 201.9	$ 802.6	$ 654.5

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