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Supplemental Cash Flow Information (Schedule of Net Changes In Operating Assets and Liabilities) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] |  |
Trade and other receivables | $ (54.1) | $ (220.0)
Prepaid consigned vehicle charges | 6.7 | 6.4
Inventory | (10.5) | (13.0)
Advances against auction contracts | (7.9) | 4.4
Prepaid expenses and deposits | 8.4 | (9.4)
Income taxes receivable | 10.9 | (4.8)
Auction proceeds payable | 177.3 | 165.0
Trade and other liabilities | (173.7) | (62.1)
Income taxes payable | (18.8) | 25.0
Operating lease obligations | (33.5) | (33.7)
Other, including CRA deposit | (30.2) | 0.4
Net changes in operating assets and liabilities | $ (125.4) | $ (141.8)

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- Definition The increase (decrease) during the reporting period in the amount due from customers, which arise when the Company pays customers (owners), in advance, a portion of the expected gross auction proceeds from the sale of related assets at future auctions. + References No definition available. + Details
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- Definition The increase (decrease) during the period in the amount due to consignors for equipment and other assets accepted for auction by the Company that are payable within one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Change in recurring obligations of a business that arise from the acquisition of merchandise, materials, supplies and services used in the production and sale of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of increase (decrease) in prepaid expenses, and assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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