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Income Taxes - Reconciliation of Income before Income Taxes and Total Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Income / (loss) before income taxes $ 22.2 $ 26.5 $ (9.7)
Provision for income taxes at the U.K. statutory tax rate (2025: 25.0%%, 2024: 25.0%, 2023: 23.5%) 5.6 6.6 (2.3)
Difference of basis in accounting 1.8 (0.5) 0.0
Other 0.5 0.6 0.0
Effect of changes in tax laws or rates enacted in the current period 0.0 0.0 (0.1)
Tax credits (0.5) (0.2) (0.7)
Total provision for income taxes $ 9.1 $ 8.2 $ (7.1)
Percent      
Provision for income taxes at the U.K. statutory tax rate (2025: 25.0%%, 2024: 25.0%, 2023: 23.5%) 25.00% 25.00% 23.50%
Difference of basis in accounting 8.10% (1.90%) 0.00%
Other 2.30% 2.30% 0.00%
Effect of changes in tax laws or rates enacted in the current period 0.00% 0.00% 1.00%
Tax credits (2.30%) (0.80%) 7.20%
Total provision for income taxes 41.00% 30.90% 73.20%
United States      
Amount      
Tax impact of defined benefit pension settlement $ 0.0 $ 0.0 $ (4.9)
Nontaxable or nondeductible items 1.2 1.9 0.4
Other $ 0.2 $ 0.5 $ 0.6
Percent      
Tax impact of defined benefit pension settlement 0.00% 0.00% 50.50%
Nontaxable or nondeductible items 5.40% 7.20% (4.10%)
Other 0.90% 1.90% (6.20%)
Foreign - Other      
Amount      
Other foreign jurisdictions $ 0.3 $ (0.7) $ (0.1)
Percent      
Foreign tax effects 1.40% (2.60%) 1.00%