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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, 2016 |  |  | $ 0.1 | $ 0.0 |  | $ 1.4 | $ 1,259.6 |  |  |  | $ 2,392.3 |  |  |  | $ (27.1) | $ (0.5) | $ 22.5
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the period |  | $ (0.1) |  |  |  | 0.1 |  |  |  |  | (0.1) |  |  |  |  |  |
New shares issued |  |  |  |  |  |  |  | $ 0.1 |  |  |  |  |  |  |  |  |
Preference share redemption |  |  |  |  |  |  |  |  | $ (133.2) |  |  |  |  |  |  |  |
Preference shares redemption costs |  | 2.4 |  |  |  |  |  |  | (2.4) | [1] |  |  |  |  |  |  |
Share-based compensation | [2] |  |  |  |  |  | 13.2 |  |  |  |  |  |  |  |  |  |
Net income for the period |  | 96.5 |  |  |  |  |  |  |  |  | 96.5 |  |  |  |  |  |
Dividends on ordinary shares |  |  |  |  |  |  |  |  |  |  |  | $ (13.2) |  |  |  |  |
Dividends on preference shares |  | (10.5) |  |  |  |  |  |  |  |  |  |  | $ (10.5) |  |  |  |
Change for the period, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12.9) |  | 2.1
Shareholder's equity, ending balance at Mar. 31, 2017 |  | 3,594.4 | 0.1 | 0.0 |  | 1.5 | 1,142.1 |  |  |  | 2,465.4 |  |  |  | (40.0) | 0.7 | 24.6
Shareholder's equity, beginning balance at Dec. 31, 2016 |  |  | 0.1 | 0.0 |  | 1.4 | 1,259.6 |  |  |  | 2,392.3 |  |  |  | (27.1) | (0.5) | 22.5
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares redemption costs | [1] |  |  |  |  |  |  |  | 2.4 |  |  |  |  |  |  |  |
Shareholder's equity, ending balance at Dec. 31, 2017 |  | 2,928.5 | 0.1 | 0.0 |  | 2.7 | 954.7 |  |  |  | 2,026.9 |  |  |  | (67.7) | 2.1 | 9.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 |
Total accumulated other comprehensive (loss)/income, net of taxes |  | (14.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-09 | [3] |  |  |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |
Total accumulated other comprehensive (loss)/income, net of taxes |  | (55.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-09 |  |  |  |  |  |  | 7.9 |  |  |  | 2.8 |  |  |  |  |  |
Net change attributable to non-controlling interest for the period |  | (0.2) |  |  |  | 0.2 |  |  |  |  | (0.2) |  |  |  |  |  |
New shares issued |  |  |  |  |  |  |  | $ 0.2 |  |  |  |  |  |  |  |  |
Preference share redemption |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |  |
Preference shares redemption costs |  | 0.0 |  |  |  |  |  |  | $ 0.0 | [1] |  |  | 0.0 | [1] |  |  |
Share-based compensation | [2] |  |  |  |  |  | 4.6 |  |  |  |  |  |  |  |  |  |
Net income for the period |  | 30.8 |  |  |  |  |  |  |  |  | 30.8 |  |  |  |  |  |
Dividends on ordinary shares |  |  |  |  |  |  |  |  |  |  |  | $ (14.3) |  |  |  |  |
Dividends on preference shares |  | (7.6) |  |  |  |  |  |  |  |  |  |  | $ (7.6) |  |  |  |
Change for the period, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6.5) |  | (77.4)
Shareholder's equity, ending balance at Mar. 31, 2018 |  | 2,859.0 | $ 0.1 | $ 0.0 |  | $ 2.9 | $ 959.5 |  |  |  | 2,035.6 |  |  |  | $ (74.2) | 2.8 | $ (67.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 7.401% |  |  |  |  |  |  |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.7 |
Total accumulated other comprehensive (loss)/income, net of taxes |  | $ (139.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-09 | [3] |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |  |
[1] | The $2.4 million deduction from net income in 2017 is attributable to the reclassification from additional paid-in capital to retained earnings representing 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.
[2] | The balance in 2017 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.
[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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