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Note 6 - Revenues (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Insurance: |  |  |  |  |  |  |  |  |  |  |  |
Underwriting |  | $ | 1,892.7 |  |  | $ | 1,734.5 |  |  | $ | 1,555.1 |
Claims |  |  | 788.7 |  |  |  | 702.5 |  |  |  | 651.8 |
Total Insurance |  |  | 2,681.4 |  |  |  | 2,437.0 |  |  |  | 2,206.9 |
Specialized Markets |  |  | — |  |  |  | 22.4 |  |  |  | 112.8 |
Financial Services |  |  | — |  |  |  | 37.6 |  |  |  | 142.8 |
Total revenues |  | $ | 2,681.4 |  |  | $ | 2,497.0 |  |  | $ | 2,462.5 |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 2,238.3 |  |  | $ | 2,120.1 |  |  | $ | 2,057.7 |
United Kingdom |  |  | 190.1 |  |  |  | 169.5 |  |  |  | 169.0 |
Other countries |  |  | 253.0 |  |  |  | 207.4 |  |  |  | 235.8 |
Total revenues |  | $ | 2,681.4 |  |  | $ | 2,497.0 |  |  | $ | 2,462.5 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
Contract Liabilities at December 31, 2021 |  | $ | 349.3 |
Revenue |  |  | (2,497.0 | )
Acquisitions |  |  | 3.4 |
Dispositions |  |  | (61.0 | )
Billings |  |  | 2,527.0 |
Contract Liabilities at December 31, 2022 |  |  | 321.7 |
Revenue |  |  | (2,681.4 | )
Foreign currency translation adjustment |  |  | (3.0 | )
Billings |  |  | 2,737.8 |
Contract Liabilities at December 31, 2023 |  | $ | 375.1 |

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