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Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenue $ 981.8 $ 1,019.8 $ 3,142.6 $ 2,638.7
Total service revenue        
Disaggregation of Revenue [Line Items]        
Revenue 779.9 773.8 2,488.1 1,923.4
Transactional seller revenue        
Disaggregation of Revenue [Line Items]        
Revenue 206.6 223.2 695.9 607.0
Transactional buyer revenue        
Disaggregation of Revenue [Line Items]        
Revenue 486.9 476.6 1,522.3 1,104.5
Marketplace services revenue        
Disaggregation of Revenue [Line Items]        
Revenue 86.4 74.0 269.9 211.9
Inventory sales revenue        
Disaggregation of Revenue [Line Items]        
Revenue $ 201.9 $ 246.0 $ 654.5 $ 715.3