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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%

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