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Note 7 - Property, Equipment and Software | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | Note 7 — Property, Equipment and Software The following table presents depreciation expense for the years ended December 31, 2024, 2023 and 2022 (in millions): ​
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Depreciation expense |  | $ | 17.4 |  |  | $ | 18.4 |  |  | $ | 21.6 |
​ Property, equipment and software as of December 31, 2024 and 2023, are summarized as follows (in millions): ​
​ | ​ | Depreciation |  | December 31, |
​ |  | period |  | 2024 |  |  | 2023 |
Furniture, fixtures and computer equipment |  | 3 - 5 years |  | $ | 53.0 |  |  | $ | 50.1 |
Leasehold improvements |  | Over the shorter of the useful life or the lease term |  |  | 53.7 |  |  |  | 47.7 |
Computer software | ​ | 3 years |  |  | 95.2 |  |  |  | 103.3 |
Property, equipment and software, gross | ​ | ​ |  | $ | 201.9 |  |  | $ | 201.1 |
Accumulated depreciation | ​ | ​ |  |  | (162.5 | ) |  |  | (156.9 | )
Property, equipment and software, net | ​ | ​ |  | $ | 39.4 |  |  | $ | 44.2 |

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