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Segmented information (Schedule of Carrying Value Goodwill) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Goodwill | $ 840,610,000 | $ 672,310,000 | $ 671,594,000
Auctions and Marketplaces [Member] |  |  |
Goodwill | 653,183,000 | 652,243,000 |
Auctions and Marketplaces [Member] | Mascus and Rouse [Member] |  |  |
Goodwill | 21,656,938 |  |
Other Reporting Unit [Member] |  |  |
Goodwill | 187,427,000 | $ 20,067,000 |
Other Reporting Unit [Member] | Mascus and Rouse [Member] |  |  |
Goodwill | $ 165,770,062 |  |

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