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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions | Total | Ordinary shares | Preference shares | 7.401% preference shares | Non-controlling interest | Additional paid-in capital | Additional paid-in capital Ordinary shares | Additional paid-in capital Preference shares | Retained earnings | Retained earnings Ordinary shares | Retained earnings Preference shares | Cumulative foreign currency translation adjustments, net of taxes: | Loss on derivatives, net of taxes: | Unrealized appreciation on investments, net of taxes:
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Shareholder's equity, beginning balance at Dec. 31, 2015 |  |  |  |  |  | $ 1.3 | $ 1,075.3 |  |  |  | $ 2,283.6 |  |  |  |  | $ 0.6 | $ (1.2) | $ 60.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the period |  | $ (0.2) |  |  |  | 0.2 |  |  |  |  | (0.2) |  |  |  |  |  |  |
New ordinary shares issued |  |  |  |  |  |  |  | $ 1.9 |  |  |  |  |  |  |  |  |  |
Ordinary shares repurchased and cancelled |  | (43.5) |  |  |  |  |  | (43.5) |  |  |  |  |  |  |  |  |  |
Share-based compensation | [1] |  |  |  |  |  | 6.8 |  |  |  |  |  |  |  |  |  |  |
Net income for the period |  | 179.3 |  |  |  |  |  |  |  |  | 179.3 |  |  |  |  |  |  |
Dividends on ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  | $ (26.2) |  |  |  |  |
Dividends on preference shares |  | (18.9) |  |  |  |  |  |  |  |  |  |  |  | $ (18.9) |  |  |  |
Preference shares redemption |  | 0.0 |  |  |  |  |  |  | $ 0.0 | [2] |  |  |  | 0.0 | [2] |  |  |
Change for the period, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12.8) |  | 114.1
Shareholder's equity, ending balance at Jun. 30, 2016 |  | 3,616.8 | $ 0.1 | $ 0.0 |  | 1.5 | 1,040.5 |  |  |  | 2,417.6 |  |  |  |  | (12.2) | (5.0) | 174.3
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference share redemption |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |
Shareholder's equity, beginning balance at Dec. 31, 2015 |  |  |  |  |  | 1.3 | 1,075.3 |  |  |  | 2,283.6 |  |  |  |  | 0.6 | (1.2) | 60.2
Shareholder's equity, ending balance at Dec. 31, 2016 |  | 3,648.3 |  |  |  | 1.4 | 1,259.6 |  |  |  | 2,392.3 |  |  |  |  | (27.1) | (0.5) | 22.5
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, rate |  |  |  |  | 7.401% |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.8) |
Total accumulated other comprehensive (loss)/income, net of taxes |  | 157.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-09 | [3] |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |
Total accumulated other comprehensive (loss)/income, net of taxes |  | (5.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the period |  | (0.2) |  |  |  | 0.2 |  |  |  |  | (0.2) |  |  |  |  |  |  |
New ordinary shares issued |  |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |
Ordinary shares repurchased and cancelled |  | (10.0) |  |  |  |  |  | $ (10.0) |  |  |  |  |  |  |  |  |  |
Share-based compensation | [1] |  |  |  |  |  | 6.0 |  |  |  |  |  |  |  |  |  |  |
Net income for the period |  | 172.3 |  |  |  |  |  |  |  |  | 172.3 |  |  |  |  |  |  |
Dividends on ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  | $ (27.6) |  |  |  |  |
Dividends on preference shares |  | (21.0) |  |  |  |  |  |  |  |  |  |  |  | (21.0) |  |  |  |
Preference shares redemption |  | (2.4) |  |  |  |  |  |  | 2.4 | [2] |  |  |  | $ (2.4) | [2] |  |  |
Change for the period, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34.2) |  | 13.9
Shareholder's equity, ending balance at Jun. 30, 2017 |  | 3,620.9 | $ 0.1 | $ 0.0 |  | $ 1.6 | 1,125.2 |  |  |  | 2,516.2 |  |  |  |  | $ (61.3) | 2.7 | $ 36.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, rate |  |  |  |  | 7.401% |  |  |  |  |  |  |  |  |  |  |  |  |
Preference share redemption |  |  |  |  |  |  |  |  | $ 133.2 |  |  |  |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2 |
Total accumulated other comprehensive (loss)/income, net of taxes |  | $ (22.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-09 |  |  |  |  |  |  | $ 7.9 |  |  |  | $ 2.8 | [3] |  |  |  |  |  |
[1] | The balance includes $7.9 million reclassification from accrued expenses and other payable as a result of the classification of restricted share units as equity following the adoption of ASU 2016-09. The adjustment has been applied using a modified retrospective approach.
[2] | The $2.4 million reclassification from additional paid-in capital to retained earnings is the difference between the capital raised upon issuance of the 7.401% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the final redemption costs of $133.2 million.
[3] | The $2.8 million relates to the cumulative effect-adjustment to opening retained earnings as a result of the classification of restricted share units as equity following the adoption of ASU 2016-09. The adjustment has been applied using a modified retrospective approach.

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