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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. $ 14.0 $ (5.5) $ 1.8
(Loss) before tax, U.S. 19.7 (60.0) (81.0)
(Loss) from operations before income taxes (31.5) (218.8) (156.0)
Current tax (benefit)/expense, Non-U.S. 5.3 4.0 4.4
Current tax (benefit)/expense, U.S. 8.9 1.0 6.1
Current tax (benefit)/expense, Total 14.3 (1.7) (1.7)
Deferred tax (benefit), Non-U.S. 0.0 0.9 (0.3)
Deferred tax (benefit), U.S. (5.7) 6.5 (8.1)
Deferred tax, Total (5.7) 24.7 (8.5)
Total tax expense/(benefit), Non-U.S. 5.3 4.9 4.1
Total tax expense/(benefit), U.S. 3.2 7.4 (2.0)
Total tax expense/(benefit) 8.6 22.9 (10.2)
Current tax expenses (benefit) related to prior year 4.5    
Deferred tax benefit, unrealized gain on investments 5.7    
Bermuda      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. (77.6) (107.6) (72.1)
Current tax (benefit)/expense, Non-U.S. 0.0 0.0 0.0
Deferred tax (benefit), Non-U.S. 0.0 0.0 0.0
Total tax expense/(benefit), Non-U.S. 0.0 0.0 0.0
U.K.      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 12.4 (45.7) (4.7)
Current tax (benefit)/expense, Non-U.S. 0.1 (6.7) (12.2)
Deferred tax (benefit), Non-U.S. 0.0 17.3 (0.1)
Total tax expense/(benefit), Non-U.S. $ 0.1 $ 10.6 $ (12.3)