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Earnings per Ordinary Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]        
Net income/(loss) $ (15.1) $ (253.8) $ 1.0 $ (81.5)
Preference share dividends (7.6) (7.7) (22.8) (28.7)
Change in redemption value 0.0 (5.6) 0.0 (8.0)
Proportion due to non-controlling interest 0.1 (0.6) (0.2) (0.8)
Basic and diluted net (loss) available to ordinary shareholders (2) (22.6) (267.7) (22.0) (119.0)
Diluted net income available to ordinary shareholders $ (22.6) $ (267.7) $ (22.0) $ (119.0)
Ordinary shares:        
Basic weighted average ordinary shares 59,692,623 59,759,730 59,637,361 59,862,540
Weighted average effect of dilutive securities 0 0 0 0
Total diluted weighted average ordinary shares 59,692,623 59,759,730 59,637,361 59,862,540
(Loss)/earnings per ordinary share:        
Basic (in usd per share) $ (0.38) $ (4.48) $ (0.37) $ (1.99)
Diluted (in usd per share) $ (0.38) $ (4.48) $ (0.37) $ (1.99)
7.401% preference shares        
(Loss)/earnings per ordinary share:        
Preference shares, rate     7.401%  
7.250% preference shares        
(Loss)/earnings per ordinary share:        
Preference shares, rate     7.25%  
Additional paid-in capital | Redemption costs of preference shares        
Class of Stock [Line Items]        
Change in redemption value [1]     $ 0.0 $ 8.0
(Loss)/earnings per ordinary share:        
Stock Redeemed or Called During Period, Value     $ 0.0 $ 293.2
[1] The $8.0 million deduction from net income in 2017 is attributable to the reclassification from additional paid-in capital to retained earnings representing the difference between the capital raised upon issuance of the 7.401% and 7.250% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the final redemption costs of $293.2 million.