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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table presents revenue disaggregated by type:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Transactional seller revenue |  | $ | 215.8 |  |  | $ | 206.6 |  |  | $ | 673.6 |  |  | $ | 695.9 |
Transactional buyer revenue |  | 543.8 |  |  | 486.9 |  |  | 1,661.1 |  |  | 1,522.3 |
Marketplace services revenue |  | 85.4 |  |  | 86.4 |  |  | 250.0 |  |  | 269.9 |
Total service revenue |  | 845.0 |  |  | 779.9 |  |  | 2,584.7 |  |  | 2,488.1 |
Inventory sales revenue |  | 247.7 |  |  | 201.9 |  |  | 802.6 |  |  | 654.5 |
Total revenue |  | $ | 1,092.7 |  |  | $ | 981.8 |  |  | $ | 3,387.3 |  |  | $ | 3,142.6 |
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 September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
United States |  | $ | 799.7 |  |  | $ | 724.0 |  |  | $ | 2,470.1 |  |  | $ | 2,282.7 |
Canada |  | 157.9 |  |  | 130.7 |  |  | 496.6 |  |  | 466.4 |
Europe |  | 79.1 |  |  | 84.9 |  |  | 248.3 |  |  | 248.5 |
Australia |  | 33.7 |  |  | 27.1 |  |  | 103.9 |  |  | 88.9 |
Other |  | 22.3 |  |  | 15.1 |  |  | 68.4 |  |  | 56.1 |
Total revenue |  | $ | 1,092.7 |  |  | $ | 981.8 |  |  | $ | 3,387.3 |  |  | $ | 3,142.6 |

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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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