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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 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Class of Stock [Line Items]      
Net income $ 30.8 $ 96.5  
Preference share dividends (7.6) (10.5)  
Change in redemption value 0.0 (2.4)  
Proportion due to non-controlling interest (0.2) (0.1)  
Basic and diluted net income available to ordinary shareholders 23.0 83.5  
Diluted net income available to ordinary shareholders $ 23.0 $ 83.5  
Ordinary shares:      
Basic weighted average ordinary shares 59,546,165 59,862,662  
Weighted average effect of dilutive securities 966,982 1,334,110  
Total diluted weighted average ordinary shares 60,513,147 61,196,772  
Earnings per ordinary share:      
Basic (in usd per share) $ 0.39 $ 1.39  
Diluted (in usd per share) $ 0.38 $ 1.36  
7.401% preference shares      
Earnings per ordinary share:      
Preference shares, rate 7.401%    
Retained earnings      
Class of Stock [Line Items]      
Net income $ 30.8 $ 96.5  
Proportion due to non-controlling interest (0.2) (0.1)  
Retained earnings | Redemption costs of preference shares      
Class of Stock [Line Items]      
Preference share dividends (7.6) (10.5)  
Change in redemption value [1] 0.0    
Additional paid-in capital | Redemption costs of preference shares      
Class of Stock [Line Items]      
Change in redemption value [1] 0.0 2.4 $ (2.4)
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.