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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%

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