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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions | Total | Ordinary Shares | Preference Shares | 7.401% Preference Shares | 7.250% 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: | Gain/(loss) on derivatives, net of taxes: | Unrealized appreciation on available for sale investments, net of taxes:
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Preference share redemption costs |  | $ 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity beginning balance at Dec. 31, 2014 |  |  | $ 0.1 | $ 0.0 |  |  | $ 0.5 | $ 1,134.3 |  |  | $ 2,050.1 |  |  |  | $ 72.7 | $ (3.8) | $ 165.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the year |  | 0.8 |  |  |  |  | 0.8 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | $ 6.8 | $ 0.0 |  |  |  |  |  |  |
Ordinary shares repurchased and cancelled |  |  |  |  |  |  |  |  | (83.7) |  |  |  |  |  |  |  |
Preference shares redeemed and cancelled |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |
Preference shares redemption | [1] |  |  |  |  |  |  |  |  | 0.0 |  |  |  | $ 0.0 |  |  |
Share-based compensation | [2] |  |  |  |  |  |  | 17.9 |  |  |  |  |  |  |  |  |
Net (loss)/income for the year |  | 323.1 |  |  |  |  |  |  |  |  | 323.1 |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ (50.9) | (37.8) |  |  |
Amount attributable to non-controlling interest |  | (0.8) |  |  |  |  | (0.8) |  |  |  |  |  |  |  |  |  |
Dividends due to non-controlling interest |  |  |  |  |  |  |  |  |  |  | (0.1) |  |  |  |  |  |
Change for the year, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (72.1) |  | (105.2)
Shareholder's equity ending balance at Dec. 31, 2015 |  | 3,419.9 | 0.1 | 0.0 |  |  | 1.3 | 1,075.3 |  |  | 2,283.6 |  |  |  | 0.6 | (1.2) | 60.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment | Accounting Standards Update 2016-09 | [3] |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.6 |
Total accumulated other comprehensive (losses)/income, net of taxes |  | 59.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference share redemption costs |  | 0.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the year |  | 0.1 |  |  |  |  | 0.1 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | 2.5 | 241.3 |  |  |  |  |  |  |
Ordinary shares repurchased and cancelled |  |  |  |  |  |  |  |  | (75.0) |  |  |  |  |  |  |  |
Preference shares redeemed and cancelled |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |
Preference shares redemption | [1] |  |  |  |  |  |  |  |  | 0.0 |  |  |  | 0.0 |  |  |
Share-based compensation | [2] |  |  |  |  |  |  | 15.5 |  |  |  |  |  |  |  |  |
Net (loss)/income for the year |  | 203.4 |  |  |  |  |  |  |  |  | 203.4 |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  | (52.7) | (41.8) |  |  |
Amount attributable to non-controlling interest |  | (0.1) |  |  |  |  | (0.1) |  |  |  |  |  |  |  |  |  |
Dividends due to non-controlling interest |  |  |  |  |  |  |  |  |  |  | (0.1) |  |  |  |  |  |
Change for the year, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (27.7) |  | (37.7)
Shareholder's equity ending balance at Dec. 31, 2016 |  | 3,648.3 | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 7.401% | 7.25% |  |  |  |  |  |  |  |  |  |  |
Share-based payment | Accounting Standards Update 2016-09 | [3] |  |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |
Total accumulated other comprehensive (losses)/income, net of taxes |  | (5.1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference share redemption costs |  | (8.0) |  |  |  |  |  |  |  | 8.0 |  |  |  |  |  |  |
Net change attributable to non-controlling interest for the year |  | 1.3 |  |  |  |  | 1.3 |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | 0.5 | 0.0 |  |  |  |  |  |  |
Ordinary shares repurchased and cancelled |  |  |  |  |  |  |  |  | $ (30.0) |  |  |  |  |  |  |  |
Preference shares redeemed and cancelled |  |  |  |  |  |  |  |  |  | (293.2) |  |  |  |  |  |  |
Preference shares redemption | [1] |  |  |  |  |  |  |  |  | $ (8.0) |  |  |  | 8.0 |  |  |
Share-based compensation | [2] |  |  |  |  |  |  | 9.8 |  |  |  |  |  |  |  |  |
Net (loss)/income for the year |  | (266.4) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  | $ (56.2) | $ (36.2) |  |  |
Amount attributable to non-controlling interest |  | (1.3) |  |  |  |  | (1.3) |  |  |  |  |  |  |  |  |  |
Dividends due to non-controlling interest |  |  |  |  |  |  |  |  |  |  | (0.1) |  |  |  |  |  |
Change for the year, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40.6) |  | (12.8)
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 7.401% | 7.25% |  |  |  |  |  |  |  |  |  |  |
Share-based payment | Accounting Standards Update 2016-09 |  |  |  |  |  |  |  | $ 7.9 |  |  | $ 2.8 | [3] |  |  |  |  |
Net change from current period hedged transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.6 |
Total accumulated other comprehensive (losses)/income, net of taxes |  | $ (55.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The $8.0 million reclassification from additional paid-in capital to retained earnings is the difference between the capital raised upon issuance of the 7.401% and 7.250% Perpetual Non-Cumulative Preference Shares, net of issuance costs, and the final redemption costs of $293.2 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 -“Compensation — Stock Compensation”.
[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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