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Note 21 - Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
​ |  | Year ended December 31, |
Operating revenues: |  | 2024 |  |  | 2023 |  |  | 2022 |
U.S. |  | $ | 1,582.2 |  |  | $ | 1,304.3 |  |  | $ | 1,324.6 |
UK |  |  | 391.2 |  |  |  | 350.4 |  |  |  | 315.1 |
Luxembourg |  |  | 452.2 |  |  |  | 400.6 |  |  |  | 512.5 |
Australia and other |  |  | 47.6 |  |  |  | 46.5 |  |  |  | 51.4 |
Total |  | $ | 2,473.2 |  |  | $ | 2,101.8 |  |  | $ | 2,203.6 |
​ |  | December 31, |
Long-lived assets: |  | 2024 |  |  | 2023 |
U.S. |  | $ | 2,143.6 |  |  | $ | 2,093.9 |
UK |  |  | 334.1 |  |  |  | 343.0 |
Australia and other |  |  | 35.0 |  |  |  | 38.6 |
Total |  | $ | 2,512.7 |  |  | $ | 2,475.5 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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