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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents revenue disaggregated by type:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Transactional seller revenue |  | $ | 241.0 |  |  | $ | 250.7 |  |  | $ | 457.8 |  |  | $ | 489.3 |
Transactional buyer revenue |  | 560.6 |  |  | 510.0 |  |  | 1,117.3 |  |  | 1,035.4 |
Marketplace services revenue |  | 85.6 |  |  | 98.4 |  |  | 164.6 |  |  | 183.5 |
Total service revenue |  | 887.2 |  |  | 859.1 |  |  | 1,739.7 |  |  | 1,708.2 |
Inventory sales revenue |  | 298.8 |  |  | 237.0 |  |  | 554.9 |  |  | 452.6 |
Total revenue |  | $ | 1,186.0 |  |  | $ | 1,096.1 |  |  | $ | 2,294.6 |  |  | $ | 2,160.8 |
Geographic Information of Revenue | 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,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
United States |  | $ | 815.7 |  |  | $ | 767.5 |  |  | $ | 1,670.4 |  |  | $ | 1,558.7 |
Canada |  | 213.8 |  |  | 193.3 |  |  | 338.7 |  |  | 335.7 |
Europe |  | 78.6 |  |  | 76.5 |  |  | 169.2 |  |  | 163.6 |
Australia |  | 53.1 |  |  | 34.2 |  |  | 70.2 |  |  | 61.8 |
Other |  | 24.8 |  |  | 24.6 |  |  | 46.1 |  |  | 41.0 |
Total revenue |  | $ | 1,186.0 |  |  | $ | 1,096.1 |  |  | $ | 2,294.6 |  |  | $ | 2,160.8 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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