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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 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]          
Net income $ 75.8 $ 64.9 $ 172.3 $ 179.3  
Preference share dividends (10.5) (9.4) (21.0) (18.9)  
Change in redemption value 0.0 0.0 (2.4) 0.0  
Proportion due to non-controlling interest (0.1) (0.4) (0.2) (0.2)  
Net Income (Loss) Available to Common Stockholders, Basic 65.2 55.1 148.7 160.2  
Net Income (Loss) Available to Common Stockholders, Diluted $ 65.2 $ 55.1 $ 148.7 $ 160.2  
Ordinary shares:          
Basic weighted average ordinary shares 59,966,358 60,705,028 59,914,797 60,771,601  
Weighted average effect of dilutive securities 1,056,623 1,487,114 1,181,020 1,491,608  
Total diluted weighted average ordinary shares 61,022,981 62,192,142 61,095,817 62,263,209  
Earnings per ordinary share:          
Basic (in usd per share) $ 1.09 $ 0.91 $ 2.48 $ 2.64  
Diluted (in usd per share) $ 1.07 $ 0.89 $ 2.43 $ 2.57  
Payment for preferred shares redemption     $ 133.2 $ 0.0  
7.401% preference shares          
Earnings per ordinary share:          
Preference shares, rate     7.401%   7.401%