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Revenue
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue
Note 5. Revenue
The following table presents revenue disaggregated by type:
Three months ended
June 30,		Six months ended
June 30,
2025202420252024
Transactional seller revenue$241.0 $250.7 $457.8 $489.3 
Transactional buyer revenue560.6 510.0 1,117.3 1,035.4 
Marketplace services revenue85.6 98.4 164.6 183.5 
Total service revenue887.2 859.1 1,739.7 1,708.2 
Inventory sales revenue298.8 237.0 554.9 452.6 
Total revenue$1,186.0 $1,096.1 $2,294.6 $2,160.8 
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
June 30,		Six months ended
June 30,
2025202420252024
United States$815.7 $767.5 $1,670.4 $1,558.7 
Canada213.8 193.3 338.7 335.7 
Europe78.6 76.5 169.2 163.6 
Australia53.1 34.2 70.2 61.8 
Other24.8 24.6 46.1 41.0 
Total revenue$1,186.0 $1,096.1 $2,294.6 $2,160.8