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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 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]          
Net (loss)/income $ (253.8) $ 95.6 $ (81.5) $ 274.9  
Preference share dividends (7.7) (9.5) (28.7) (28.4)  
Change in redemption value (5.6) 0.0 (8.0) 0.0  
Proportion due to non-controlling interest (0.6) 0.2 (0.8) 0.0  
Basic and diluted net (loss) income available to ordinary shareholders (267.7) 86.3 (119.0) 246.5  
Diluted net income available to ordinary shareholders $ (267.7) $ 86.3 $ (119.0) $ 246.5  
Ordinary shares:          
Basic weighted average ordinary shares 59,759,730 [1] 60,225,705 59,862,540 [1] 60,588,307  
Weighted average effect of dilutive securities 0 1,351,313 0 1,455,133  
Total diluted weighted average ordinary shares 59,759,730 [1] 61,577,018 59,862,540 [1] 62,043,440  
(Loss) earnings per ordinary share:          
Basic (in usd per share) $ (4.48) $ 1.43 $ (1.99) $ 4.07  
Diluted (in usd per share) $ (4.48) $ 1.40 $ (1.99) $ 3.97  
Payment for preferred shares redemption     $ 293.2 $ 0.0  
7.401% preference shares          
(Loss) earnings per ordinary share:          
Preference shares, rate     7.401%   7.401%
7.250% preference shares          
(Loss) earnings per ordinary share:          
Preference shares, rate     7.25%   7.25%
[1] The basic and diluted number of ordinary shares for the three and nine months ended September 30, 2017 is the same as the inclusion of dilutive securities in a loss making period would be anti-dilutive.