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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]        
Net income $ (14.7) $ 75.8 $ 16.1 $ 172.3
Preference share dividends (7.6) (10.5) (15.2) (21.0)
Change in redemption value 0.0 0.0 0.0 (2.4)
Proportion due to non-controlling interest (0.1) (0.1) (0.3) (0.2)
Basic and diluted net (loss)/income available to ordinary shareholders (2) (22.4) 65.2 0.6 148.7
Diluted net income available to ordinary shareholders $ (22.4) $ 65.2 $ 0.6 $ 148.7
Ordinary shares:        
Basic weighted average ordinary shares 59,671,684 59,966,358 59,609,271 59,914,797
Weighted average effect of dilutive securities 0 1,056,623 918,865 1,181,020
Total diluted weighted average ordinary shares 59,671,684 61,022,981 60,528,136 61,095,817
(Loss)/earnings per ordinary share:        
Basic (in usd per share) $ (0.38) $ 1.09 $ 0.01 $ 2.48
Diluted (in usd per share) $ (0.38) $ 1.07 $ 0.01 $ 2.43
7.401% preference shares        
(Loss)/earnings per ordinary share:        
Preference shares, rate     7.401%  
Additional paid-in capital | Redemption costs of preference shares        
Class of Stock [Line Items]        
Change in redemption value [1]     $ 0.0 $ 2.4
(Loss)/earnings per ordinary share:        
Stock Redeemed or Called During Period, Value     $ 0.0 $ 133.2
[1] The $2.4 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% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the final redemption costs of $133.2 million.