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Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Examination [Line Items]      
(Loss) before tax, U.S. $ 269.0 $ 236.3 $ 34.8
Income (loss) from operations before income taxes 464.1 402.6 (27.0)
Current tax (benefit)/expense, U.S. 62.7 52.4 14.8
Current tax (benefit)/expense, Total 66.6 65.6 26.5
Deferred tax (benefit), U.S. (4.4) 3.0 (102.9)
Deferred tax, Total (88.6) (197.7) (104.6)
Total tax expense/(benefit), U.S. 58.3 55.4 (88.1)
Total tax expense/(benefit) (22.0) (132.1) (78.1)
Base erosion and anti-abuse (BEAT) expense 0.2 0.9 2.3
Bermuda      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 85.3 148.8 (103.3)
Current tax (benefit)/expense, Non-U.S. 0.0 0.0 0.0
Deferred tax (benefit), Non-U.S. 1.3 (201.1) 0.0
Total tax expense/(benefit), Non-U.S. 1.3 (201.1) 0.0
Net deferred tax asset, Bermuda 158.9 156.6  
Opening tax loss adjustment 40.0 44.5  
U.K.      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 106.9 0.7 62.4
Current tax (benefit)/expense, Non-U.S. 3.9 5.3 7.0
Deferred tax (benefit), Non-U.S. (85.3) 0.1 0.0
Total tax expense/(benefit), Non-U.S. (81.4) 5.4 7.0
Deferred foreign income tax, brought forward valuation allowance 107.7    
Other      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 2.9 16.8 (20.9)
Current tax (benefit)/expense, Non-U.S. 0.0 7.9 4.7
Deferred tax (benefit), Non-U.S. (0.2) 0.3 (1.7)
Total tax expense/(benefit), Non-U.S. $ (0.2) $ 8.2 $ 3.0