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Note 17 - Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |
​ |  |  |  |  |  | Retirement |  |  | ​ |  |  |  |  |  |  | Retirement |  |  | ​ |
|  | Foreign |  |  | benefit |  |  |  |  |  |  | Foreign |  |  | benefit |  |  |  |  |
​ |  | currency |  |  | asset, net |  |  | Total |  |  | currency |  |  | asset, net |  |  | Total |
Beginning balance |  | $ | (478.9 | ) |  | $ | (84.7 | ) |  | $ | (563.6 | ) |  | $ | (577.3 | ) |  | $ | (70.4 | ) |  | $ | (647.7 | )
Other comprehensive income (loss) |  |  | (52.6 | ) |  |  | (14.3 | ) |  |  | (66.9 | ) |  |  | 96.8 |  |  |  | (15.2 | ) |  |  | 81.6 |
Reclassifications to net income(1) |  |  | 138.1 |  |  |  | 1.7 |  |  |  | 139.8 |  |  |  | 4.7 |  |  |  | 0.9 |  |  |  | 5.6 |
Total other comprehensive income (loss) |  |  | 85.5 |  |  |  | (12.6 | ) |  |  | 72.9 |  |  |  | 101.5 |  |  |  | (14.3 | ) |  |  | 87.2 |
Less: other comprehensive loss (income) attributable to noncontrolling interests |  |  | 5.5 |  |  |  | — |  |  |  | 5.5 |  |  |  | (3.1 | ) |  |  | — |  |  |  | (3.1 | )
Ending balance |  | $ | (387.9 | ) |  | $ | (97.3 | ) |  | $ | (485.2 | ) |  | $ | (478.9 | ) |  | $ | (84.7 | ) |  | $ | (563.6 | )
Comprehensive Income (Loss) [Table Text Block] |
​ |  | Pre-tax |  |  | Tax |  |  | ​ |
Year ended December 31, 2024 |  | amount |  |  | expense |  |  | Net amount |
Foreign currency translation adjustments |  | $ | (55.1 | ) |  | $ | 2.5 |  |  | $ | (52.6 | )
Retirement benefit asset, net |  |  | (17.5 | ) |  |  | 3.2 |  |  |  | (14.3 | )
Reclassifications to net income(1) |  |  | 139.8 |  |  |  | — |  |  |  | 139.8 |
Total other comprehensive income |  | $ | 67.2 |  |  | $ | 5.7 |  |  | $ | 72.9 |
​ |  | Pre-tax |  |  | Tax |  |  | ​ |
Year ended December 31, 2023 |  | amount |  |  | expense |  |  | Net amount |
Foreign currency translation adjustments |  | $ | 94.4 |  |  | $ | 2.4 |  |  | $ | 96.8 |
Retirement benefit asset, net |  |  | (18.7 | ) |  |  | 3.5 |  |  |  | (15.2 | )
Reclassifications to net income(1) |  |  | 5.6 |  |  |  | — |  |  |  | 5.6 |
Total other comprehensive income |  | $ | 81.3 |  |  | $ | 5.9 |  |  | $ | 87.2 |
​ |  | Pre-tax |  |  | Tax |  |  | ​ |
Year ended December 31, 2022 |  | amount |  |  | expense |  |  | Net amount |
Foreign currency translation adjustments |  | $ | (224.2 | ) |  | $ | 3.2 |  |  | $ | (221.0 | )
Retirement benefit asset, net |  |  | (46.8 | ) |  |  | 8.8 |  |  |  | (38.0 | )
Reclassifications to net income(1) |  |  | (3.7 | ) |  |  | — |  |  |  | (3.7 | )
Total other comprehensive income (loss) |  | $ | (274.7 | ) |  | $ | 12.0 |  |  | $ | (262.7 | )

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