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Note 8 - Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | Insurance |  |  | Energy and Specialized Markets |  |  | Financial Services |  |  | Total |
Goodwill at December 31, 2020 |  | $ | 1,208.6 |  |  | $ | 2,423.6 |  |  | $ | 475.9 |  |  | $ | 4,108.1 |
Acquisitions and purchase of controlling interest |  |  | 40.6 |  |  |  | 20.4 |  |  |  | — |  |  |  | 61.0 |
Purchase accounting reclassifications |  |  | 1.1 |  |  |  | — |  |  |  | — |  |  |  | 1.1 |
Current period adjustment (1) |  |  | 15.8 |  |  |  | (15.8 | ) |  |  | — |  |  |  | — |
Foreign currency translation adjustment |  |  | (7.1 | ) |  |  | (33.1 | ) |  |  | (0.5 | ) |  |  | (40.7 | )
Goodwill at September 30, 2021 |  | $ | 1,259.0 |  |  | $ | 2,395.1 |  |  | $ | 475.4 |  |  | $ | 4,129.5 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
| Weighted Average Useful Life (in years) |  | Cost |  |  | Accumulated Amortization |  |  | Net |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Technology-based | 7 |  | $ | 561.3 |  |  | $ | (389.0 | ) |  | $ | 172.3 |
Marketing-related | 15 |  |  | 273.6 |  |  |  | (125.6 | ) |  |  | 148.0 |
Contract-based | 6 |  |  | 5.0 |  |  |  | (5.0 | ) |  |  | — |
Customer-related | 13 |  |  | 1,013.3 |  |  |  | (407.5 | ) |  |  | 605.8 |
Database-based | 18 |  |  | 496.3 |  |  |  | (157.1 | ) |  |  | 339.2 |
Total intangible assets |  | $ | 2,349.5 |  |  | $ | (1,084.2 | ) |  | $ | 1,265.3 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Technology-based | 7 |  | $ | 559.6 |  |  | $ | (349.5 | ) |  | $ | 210.1 |
Marketing-related | 16 |  |  | 275.2 |  |  |  | (113.4 | ) |  |  | 161.8 |
Contract-based | 6 |  |  | 5.0 |  |  |  | (5.0 | ) |  |  | — |
Customer-related | 13 |  |  | 1,004.3 |  |  |  | (354.2 | ) |  |  | 650.1 |
Database-based | 19 |  |  | 501.0 |  |  |  | (138.2 | ) |  |  | 362.8 |
Total intangible assets |  | $ | 2,345.1 |  |  | $ | (960.3 | ) |  | $ | 1,384.8 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Years Ending |  | Amount |
2021 |  | $ | 43.6 |
2022 |  |  | 159.5 |
2023 |  |  | 145.8 |
2024 |  |  | 140.2 |
2025 |  |  | 115.3 |
2026 and thereafter |  |  | 660.9 |
Total |  | $ | 1,265.3 |

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