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Revenue
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue
Note 5. Revenue
The following table presents revenue disaggregated by type:
Three months ended
September 30,		Nine months ended
September 30,
2025202420252024
Transactional seller revenue$215.8 $206.6 $673.6 $695.9 
Transactional buyer revenue543.8 486.9 1,661.1 1,522.3 
Marketplace services revenue85.4 86.4 250.0 269.9 
Total service revenue845.0 779.9 2,584.7 2,488.1 
Inventory sales revenue247.7 201.9 802.6 654.5 
Total revenue$1,092.7 $981.8 $3,387.3 $3,142.6 
The following table presents revenue disaggregated by geographic area, based on the location of the underlying auction activity or rendering of services:
Three months ended
September 30,		Nine months ended
September 30,
2025202420252024
United States$799.7 $724.0 $2,470.1 $2,282.7 
Canada157.9 130.7 496.6 466.4 
Europe79.1 84.9 248.3 248.5 
Australia33.7 27.1 103.9 88.9 
Other22.3 15.1 68.4 56.1 
Total revenue$1,092.7 $981.8 $3,387.3 $3,142.6