v3.26.1
Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Oct. 07, 2022
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Income Tax Contingency [Line Items]          
Effective tax rate   (6.80%) 0.00% 99.80% 1.70%
Income tax expense (benefit)   $ 22.8 $ 0.9 $ 198.2 $ (69.1)
Effective income tax (benefit) expense   (50.2) (415.9) $ 29.8 (624.9)
Tax Jurisdiction of Domicile [Extensible Enumeration]       BERMUDA  
Unrecognized tax benefits   143.2   $ 143.2  
UTB that would impact effective tax rate   90.8   90.8  
Income tax penalties and interest expense $ 110.0        
Income tax contingency | Tax Year 2018          
Income Tax Contingency [Line Items]          
Damages sought $ 284.0        
U.K., Netherlands and Luxembourg          
Income Tax Contingency [Line Items]          
Non-deductible net losses from foreign investments   $ (75.7)   $ 79.7  
Non-deductible net losses from foreign investments (as a percent)   22.50%   40.10%  
United States          
Income Tax Contingency [Line Items]          
Effective income tax rate reconciliation, derecognition of litigation-related receivable, amount       $ 133.3  
Effective income tax rate reconciliation, derecognition of litigation-related receivable, percent       67.10%  
U.K., U.S. and Netherlands          
Income Tax Contingency [Line Items]          
Non-deductible net losses from foreign investments       $ 30.2  
Non-deductible net losses from foreign investments (as a percent)       15.30%  
U.K.          
Income Tax Contingency [Line Items]          
Non-deductible net losses from foreign investments     $ (69.5)   $ (112.8)
Non-deductible net losses from foreign investments (as a percent)     2.50%   2.70%
Foreign exchange (loss) gains       $ 97.1  
Effective income tax rate reconciliation, foreign currency translation, percent       48.90%  
Effective income tax rate reconciliation, foreign income tax rate differential, amount     $ 259.7   $ 392.3
Effective income tax rate reconciliation, foreign income tax rate differential, percent     9.40%   9.40%
U.K., Belgium and Netherlands          
Income Tax Contingency [Line Items]          
Valuation allowances     $ 594.9   $ 903.1
Valuation allowances, percent     21.50%   21.70%
U.K. and Netherlands          
Income Tax Contingency [Line Items]          
Valuation allowances         $ 86.0
Valuation allowances, percent         2.10%