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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]      
Net income $ 96.5 $ 114.4  
Preference share dividends (10.5) (9.5)  
Change in redemption value 2.4 0.0  
Proportion due to non-controlling interest (0.1) 0.2  
Net Income (Loss) Available to Common Stockholders, Basic 83.5 105.1  
Net Income (Loss) Available to Common Stockholders, Diluted $ 83.5 $ 105.1  
Ordinary shares:      
Basic weighted average ordinary shares 59,862,662 60,867,815  
Weighted average effect of dilutive securities (2) 1,334,110 1,616,123  
Total diluted weighted average ordinary shares 61,196,772 62,483,938  
Earnings per ordinary share:      
Basic (in usd per share) $ 1.39 $ 1.73  
Diluted (in usd per share) $ 1.36 $ 1.68  
Payment for preferred shares redemption $ 133.2 $ 0.0  
7.401% preference shares      
Earnings per ordinary share:      
Preference shares, rate 7.401%   7.401%