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Note 16 - Retirement Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Interest cost $ (27.2) $ (27.6) $ (16.9)
Amortization of actuarial loss (1.3) (0.5) 0.0
Amortization of prior service cost (0.4) (0.4) (0.4)
Expected return on plan assets 26.7 28.7 13.8
Net periodic benefit credit (cost) (2.2) 0.2 (3.5)
Contributions to money purchase section (12.5) (11.6) (11.5)
Total cost (14.7) (11.4) $ (15.0)
Pension Plan [Member]      
Interest cost (27.2) (27.6)  
Amortization of actuarial loss $ (1.3) $ (0.5)  
Discount rate 4.50% 4.80% 1.90%
Inflation — RPI 3.10% 3.30% 3.40%
Inflation — CPI 2.50% 2.70% 2.80%
Pension increases (RPI capped at 5% p.a.) 3.00% 3.20% 3.30%
Pension increases (RPI capped at 2.5% p.a.) 2.10% 2.10% 2.20%
Expected return on plan assets 4.10% 4.40% 1.60%
Amortization period for net actuarial gains at beginning of the year (Year) 27 years 28 years 29 years