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Unaudited Quarterly Financial Data - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earned premium | $ 511.0 | $ 652.5 | $ 562.0 | $ 581.1 | $ 612.4 | $ 681.0 | $ 680.8 | $ 663.1 | $ 629.7 | $ 640.6 | $ 609.4 | $ 593.6 | $ 2,306.6 | $ 2,637.3 | $ 2,473.3
Net investment income | 47.5 | 46.4 | 47.4 | 47.7 | 43.2 | 46.4 | 48.0 | 49.5 | 46.4 | 45.0 | 46.7 | 47.4 | 189.0 | 187.1 | 185.5
Realized and unrealized investment gains | 18.8 | 29.9 | 49.0 | 51.2 | (29.0) | 26.7 | 45.1 | 65.6 | 12.9 | 10.7 | 13.5 | 57.4 | 148.9 | 108.4 | 94.5
Other income | 3.9 | (2.2) | 3.6 | 3.6 | 3.3 | 1.5 | (0.5) | 1.4 | (0.3) | (2.3) | (1.2) | 3.9 | 8.9 | 5.7 | 0.1
Total revenues | 581.2 | 726.6 | 662.0 | 683.6 | 629.9 | 755.6 | 773.4 | 779.6 | 688.7 | 694.0 | 668.4 | 702.3 | 2,653.4 | 2,938.5 | 2,753.4
Losses and loss adjustment expenses | 544.2 | 776.2 | 346.1 | 328.2 | 387.3 | 389.2 | 442.2 | 357.4 | 334.0 | 365.6 | 360.5 | 306.1 | 1,994.7 | 1,576.1 | 1,366.2
Amortization of deferred policy acquisition costs | 85.1 | 105.4 | 96.3 | 113.7 | 141.1 | 130.9 | 126.7 | 130.2 | 118.2 | 132.0 | 114.1 | 119.3 | 400.5 | 528.9 | 483.6
General, administrative and corporate expenses | 150.1 | 110.9 | 119.9 | 121.3 | 128.9 | 125.0 | 116.4 | 119.8 | 125.9 | 100.5 | 95.4 | 102.2 | 502.2 | 490.1 | 424.0
Interest on long-term debt | 7.3 | 7.4 | 7.4 | 7.4 | 7.4 | 7.3 | 7.4 | 7.4 | 7.4 | 7.4 | 7.3 | 7.4 | 29.5 | 29.5 | 29.5
Change in fair value of derivatives | (2.5) | (4.5) | (17.6) | (3.1) | 17.6 | (0.6) | 0.4 | 7.2 | (2.5) | (10.1) | (2.0) | 7.8 | (27.7) | 24.6 | (6.8)
Change in fair value of loan notes issued by variable interest entities | (17.6) | (9.8) | 3.3 | 2.9 | 3.4 | 9.8 | (0.5) | 4.4 | 5.3 | 8.3 | 3.3 | 2.9 | (21.2) | 17.1 | 19.8
Realized and unrealized investment losses | 4.0 | 12.4 | 7.0 | 5.0 | 29.1 | 5.2 | 8.3 | 20.6 | (17.7) | 51.9 | 28.8 | 14.5 | 28.4 | 63.2 | 77.5
Net realized and unrealized foreign exchange (gains)/losses(1) | 2.8 | (8.4) | 20.6 | 8.9 | (12.0) | (10.8) | 5.3 | 15.7 | (5.0) | 8.4 | 11.6 | 6.4 | 23.9 | (1.8) | 21.4
Other (expense) | 2.9 | 0.0 | 2.0 | 0.0 | 1.2 | (0.9) | 1.0 | 0.0 | (0.1) | 0.0 | (1.8) | 2.6 | 4.9 | 1.3 | 0.7
Total expenses | 776.3 | 989.6 | 585.0 | 584.3 | 704.0 | 655.1 | 707.2 | 662.7 | 565.5 | 664.0 | 617.2 | 569.2 | 2,935.2 | 2,729.0 | 2,415.9
(Loss)/income from operations before income tax | (195.1) | (263.0) | 77.0 | 99.3 | (74.1) | 100.5 | 66.2 | 116.9 | 123.2 | 30.0 | 51.2 | 133.1 | (281.8) | 209.5 | 337.5
Income tax credit | 10.2 | 9.2 | (1.2) | (2.8) | 2.6 | (4.9) | (1.3) | (2.5) | (5.3) | (1.8) | (2.2) | (5.1) | 15.4 | (6.1) | (14.4)
Net (loss)/income | $ (184.9) | $ (253.8) | $ 75.8 | $ 96.5 | $ (71.5) | $ 95.6 | $ 64.9 | $ 114.4 | $ 117.9 | $ 28.2 | $ 49.0 | $ 128.0 | $ (266.4) | $ 203.4 | $ 323.1
Ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average ordinary shares | 59,431,469 | 59,759,730 | 59,966,358 | 59,862,662 | 60,152,420 | 60,225,705 | 60,705,028 | 60,867,815 | 60,784,832 | 60,779,295 | 61,408,633 | 62,159,303 | 59,753,886 | 60,478,740 | 61,287,884
Diluted weighted average ordinary shares | 59,431,469 | 59,795,730 | 61,022,981 | 61,196,772 | 61,198,041 | 61,577,018 | 62,192,142 | 62,483,938 | 62,176,505 | 62,155,125 | 62,896,907 | 63,532,662 | 59,753,886 | 61,860,689 | 62,687,503
Weighted average number of ordinary share and share equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic, dollars per share | $ (3.25) | $ (4.48) | $ 1.09 | $ 1.39 | $ (1.41) | $ 1.43 | $ 0.91 | $ 1.73 | $ 1.78 | $ 0.30 | $ 0.64 | $ 1.91 | $ (5.22) | $ 2.67 | $ 4.64
Diluted, dollars per share | $ (3.25) | $ (4.48) | $ 1.07 | $ 1.36 | $ (1.41) | $ 1.40 | $ 0.89 | $ 1.68 | $ 1.75 | $ 0.30 | $ 0.62 | $ 1.87 | $ (5.22) | $ 2.61 | $ 4.54

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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