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Note 15 - Long-Term Incentive Compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
DIP |  | $ | 66.4 |  |  | $ | 70.6 |  |  | $ | 84.0 |
Other |  |  | 4.4 |  |  |  | 4.3 |  |  |  | 6.3 |
Stock-based payments expense |  | $ | 70.8 |  |  | $ | 74.9 |  |  | $ | 90.3 |
DIP funds — liability settled |  |  | 84.7 |  |  |  | 81.5 |  |  |  | 84.7 |
Social Security costs |  |  | 10.2 |  |  |  | 9.5 |  |  |  | 10.5 |
Profits interests and other, net |  |  | 0.9 |  |  |  | 1.5 |  |  |  | (4.8 | )
Total long-term incentive compensation expense |  | $ | 166.6 |  |  | $ | 167.4 |  |  | $ | 180.7 |
Employee Service Share Based Compensation Cost Not yet Recognized [Table Text Block] |
​ |  | Unrecognized |  |  | Weighted-average |
​ |  | compensation |  |  | years |
DIP |  | $ | 50.8 |  |  |  | 1.8 |
Other |  |  | 2.4 |  |  |  | 1.2 |
Stock-based payments expense |  |  | 53.2 |  |  |  | 1.8 |
DIP funds — liability settled |  |  | 41.4 |  |  |  | 1.8 |
Social Security costs |  |  | 16.2 |  |  |  | 0.7 |
Total unrecognized long-term incentive compensation expense |  | $ | 110.8 |  |  |  | 1.6 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Fair value of options granted |  | £ | 7.2 |  |  | £ | 6.2 |  |  | £ | 9.3 |
Assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  | 4.82 | % |  |  | 5.89 | % |  |  | 4.27 | %
Expected volatility |  |  | 33.95 | % |  |  | 45.33 | % |  |  | 41.82 | %
Risk-free interest rate |  |  | 4.06 | % |  |  | 3.47 | % |  |  | 1.43 | %
Expected life (years) |  |  | 3.2 |  |  |  | 3.2 |  |  |  | 3.2 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
​ |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |
​ |  | Shares |  |  | price |  |  | Shares |  |  | price |  |  | Shares |  |  | price |
Outstanding at January 1 |  |  | 284,954 |  |  | $ | 22.82 |  |  |  | 386,584 |  |  | $ | 19.18 |  |  |  | 492,889 |  |  | $ | 20.83 |
Granted |  |  | 100,151 |  |  | $ | 25.29 |  |  |  | 137,019 |  |  | $ | 21.67 |  |  |  | 127,903 |  |  | $ | 24.83 |
Exercised |  |  | (66,592 | ) |  | $ | 22.30 |  |  |  | (201,795 | ) |  | $ | 14.95 |  |  |  | (193,821 | ) |  | $ | 24.34 |
Forfeited |  |  | (25,118 | ) |  | $ | 23.21 |  |  |  | (36,854 | ) |  | $ | 23.37 |  |  |  | (40,387 | ) |  | $ | 22.78 |
Outstanding at December 31 |  |  | 293,395 |  |  | $ | 23.75 |  |  |  | 284,954 |  |  | $ | 22.82 |  |  |  | 386,584 |  |  | $ | 19.18 |
Exercisable(1) |  |  | 4,823 |  |  | $ | 23.56 |  |  |  | 5,954 |  |  | $ | 8.23 |  |  |  | 32,710 |  |  | $ | 10.46 |
Vested or expected to vest |  |  | 293,395 |  |  | $ | 23.75 |  |  |  | 284,954 |  |  | $ | 22.82 |  |  |  | 386,584 |  |  | $ | 19.18 |
Schedule of Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] |
​ |  | Year ended December 31, |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
Exercised |  | $ | 0.9 |  |  | $ | 2.4 |  |  | $ | 1.3 |
Outstanding |  | $ | 5.8 |  |  | $ | 2.3 |  |  | $ | 2.4 |
Exercisable |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.5 |
​
Schedule of Nonvested Share Activity [Table Text Block] |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
​ |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |
​ |  | Shares |  |  | price |  |  | Shares |  |  | price |  |  | Shares |  |  | price |
Unvested at January 1 |  |  | 4,884,487 |  |  | $ | 29.86 |  |  |  | 5,641,839 |  |  | $ | 29.99 |  |  |  | 4,949,927 |  |  | $ | 26.42 |
Granted |  |  | 1,996,676 |  |  | $ | 32.48 |  |  |  | 2,141,254 |  |  | $ | 27.08 |  |  |  | 3,581,420 |  |  | $ | 32.44 |
Vested |  |  | (2,647,424 | ) |  | $ | 30.25 |  |  |  | (2,669,197 | ) |  | $ | 27.93 |  |  |  | (2,733,825 | ) |  | $ | 26.29 |
Forfeited |  |  | (136,067 | ) |  | $ | 30.96 |  |  |  | (229,409 | ) |  | $ | 29.70 |  |  |  | (155,683 | ) |  | $ | 31.48 |
Unvested at December 31 |  |  | 4,097,672 |  |  | $ | 30.85 |  |  |  | 4,884,487 |  |  | $ | 29.86 |  |  |  | 5,641,839 |  |  | $ | 29.99 |
​ |  | 2024 |  |  | 2023 |  |  | 2022 |
​ |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |  |  | ​ |  |  | Weighted-average |
​ |  | Shares |  |  | price |  |  | Shares |  |  | price |  |  | Shares |  |  | price |
Unvested at January 1 |  |  | 276,537 |  |  | $ | 27.44 |  |  |  | 50,900 |  |  | $ | 29.38 |  |  |  | 258,024 |  |  | $ | 24.31 |
Granted |  |  | 247,624 |  |  | $ | 32.12 |  |  |  | 333,389 |  |  | $ | 27.44 |  |  |  | - |  |  | $ | - |
Adjustment to shares granted due to performance measures |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  |  | 39,837 |  |  | $ | 24.55 |
Vested |  |  | - |  |  | $ | - |  |  |  | (50,900 | ) |  | $ | 29.38 |  |  |  | (246,961 | ) |  | $ | 22.28 |
Forfeited |  |  | (8,441 | ) |  | $ | 31.10 |  |  |  | (56,852 | ) |  | $ | 27.44 |  |  |  | - |  |  | $ | - |
Unvested at December 31 |  |  | 515,720 |  |  | $ | 29.63 |  |  |  | 276,537 |  |  | $ | 27.44 |  |  |  | 50,900 |  |  | $ | 29.38 |

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