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Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Line Items]                              
(Loss)/income before tax, Non-U.S.                         $ 1.8 $ (26.8) $ (23.5)
(Loss)/income before tax, U.S.                         (81.0) (140.3) (70.2)
Income Tax Expense (Benefit), Intraperiod Tax Allocation                         6.1 32.8 (3.4)
(Loss)/income from operations before income tax $ (143.6) $ (30.6) $ (16.2) $ 34.4 $ (195.1) $ (263.0) $ 77.0 $ 99.3 $ (74.1) $ 100.5 $ 66.2 $ 116.9 (156.0) (281.8) 209.5
Current income tax (benefit)/expense, Non-U.S.                         4.4 3.0 1.1
Current income tax (benefit)/expense, U.S.                           0.0 0.0
Current income tax (benefit)/expense, Total                         (1.7) 17.1 (2.1)
Deferred income Tax (benefit), Non-U.S.                         (0.3) (0.3) 0.3
Deferred income Tax (benefit), U.S.                         (8.1) 1.1 2.5
Deferred Income Tax, Total                         (8.5) (32.5) 8.2
Total income tax expense/(benefit), Non-U.S.                         4.1 2.7 1.4
Total income tax expense/(benefit), U.S.                         (2.0) 1.1 2.5
Total income tax expense/(benefit) $ 3.2 $ (15.5) $ (1.5) $ 3.6 $ (10.2) $ (9.2) $ 1.2 $ 2.8 $ (2.6) $ 4.9 $ 1.3 $ 2.5 (10.2) (15.4) 6.1
Australian non-resident withholding tax                         4.4 0.9 0.0
Bermuda                              
Income Tax Examination [Line Items]                              
(Loss)/income before tax, Non-U.S.                         (72.1) (130.0) 259.5
Current income tax (benefit)/expense, Non-U.S.                         0.0 0.0 0.0
Deferred income Tax (benefit), Non-U.S.                         0.0 0.0 0.0
Total income tax expense/(benefit), Non-U.S.                         0.0 0.0 0.0
U.K.                              
Income Tax Examination [Line Items]                              
(Loss)/income before tax, Non-U.S.                         (4.7) 15.3 43.7
Current income tax (benefit)/expense, Non-U.S.                         (12.2) 14.1 (3.2)
Deferred income Tax (benefit), Non-U.S.                         (0.1) (33.3) 5.4
Total income tax expense/(benefit), Non-U.S.                         $ (12.3) $ (19.2) $ 2.2