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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. $ 16.8 $ (20.9) $ (67.9)
(Loss) before tax, U.S. 236.3 34.8 5.0
Income (loss) from operations before income taxes 402.6 (27.0) 35.1
Current tax (benefit)/expense, Non-U.S. 7.9 4.7 2.7
Current tax (benefit)/expense, U.S. 52.4 14.8 5.8
Current tax (benefit)/expense, Total 65.6 26.5 8.5
Deferred tax (benefit), Non-U.S. 0.3 (1.7) (2.9)
Deferred tax (benefit), U.S. 3.0 (102.9) 0.0
Deferred tax, Total (197.7) (104.6) (3.2)
Total tax expense/(benefit), Non-U.S. 8.2 3.0 (0.2)
Total tax expense/(benefit), U.S. 55.4 (88.1) 5.8
Total tax expense/(benefit) (132.1) (78.1) 5.3
Base erosion and anti-abuse (BEAT) expense 0.9 2.3 6.1
Bermuda      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 148.8 (103.3) 22.9
Current tax (benefit)/expense, Non-U.S. 0.0 0.0 0.0
Deferred tax (benefit), Non-U.S. (201.1) 0.0 0.0
Total tax expense/(benefit), Non-U.S. (201.1) 0.0 0.0
Net deferred tax asset, Bermuda 156.6    
Opening tax loss adjustment $ 44.5    
Deferred tax asset, utilization period 10 years    
U.K.      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. $ 0.7 62.4 75.1
Current tax (benefit)/expense, Non-U.S. 5.3 7.0 0.0
Deferred tax (benefit), Non-U.S. 0.1 0.0 (0.3)
Total tax expense/(benefit), Non-U.S. $ 5.4 $ 7.0 $ (0.3)