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Discontinued Operations - Financial Statement Disclosures (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 05, 2016 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value |  | $ 1,566.9 |  |  |  | $ 1,566.9 |  | $ 2,081.1 |  |
Short-term investments, at amortized cost (which approximates fair value) |  | 71.6 |  |  |  | 71.6 |  | 174.9 |  |
Common equity securities, at fair value |  | 827.9 |  |  |  | 827.9 |  | 285.6 |  |
Other long-term investments |  | 226.5 |  |  |  | 226.5 |  | 172.8 |  |
Total investments |  | 2,692.9 |  |  |  | 2,692.9 |  | 2,714.4 |  |
Cash |  | 53.3 |  |  |  | 53.3 |  | 80.2 |  |
Insurance premiums receivable |  | 2.8 |  |  |  | 2.8 |  | 1.6 |  |
Deferred acquisition costs |  | 13.0 |  |  |  | 13.0 |  | 10.6 |  |
Accounts receivable on unsettled investment sales |  | 199.5 |  |  |  | 199.5 |  | 4.8 |  |
Goodwill and other intangible assets |  | 49.5 | $ 52.1 |  | $ 51.5 | 49.5 | $ 51.5 | 54.7 | $ 54.2 | $ 53.0
Other assets |  | 62.8 |  |  |  | 62.8 |  | 64.1 |  |
Total assets held for sale |  | 3,696.4 |  |  |  | 3,696.4 |  | 3,599.5 |  |
Disposal Group, Including Discontinued Operation, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Unearned insurance premiums |  | 109.9 |  |  |  | 109.9 |  | 82.9 |  |
Debt |  | 10.6 |  |  |  | 10.6 |  | 12.7 |  |
Accrued incentive compensation |  | 63.3 |  |  |  | 63.3 |  | 95.7 |  |
Accounts payable on unsettled investment purchases |  | 114.6 |  |  |  | 114.6 |  | 0.0 |  |
Other liabilities |  | 44.9 |  |  |  | 44.9 |  | 46.9 |  |
Total liabilities held for sale |  | 2,678.8 |  |  |  | 2,678.8 |  | 2,569.3 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | 2.2 |  |  | 3.3 | 5.2 | 6.8 |  |  |
Net investment income |  | 14.7 |  |  | 6.1 | 27.5 | 8.6 |  |  |
Net realized and unrealized investment gains |  | 33.7 |  |  | 3.4 | 70.0 | 16.3 |  |  |
Total revenues |  | 85.4 |  |  | 49.2 | 178.9 | 108.0 |  |  |
Loss and loss adjustment expenses |  | 0.0 |  |  | 2.3 | 1.1 | 4.6 |  |  |
Insurance acquisition expenses |  | 0.9 |  |  | 1.4 | 2.2 | 3.1 |  |  |
Other underwriting expenses |  | 0.1 |  |  | 0.1 | 0.2 | 0.2 |  |  |
General and administrative expenses |  | 57.5 |  |  | 45.2 | 117.9 | 99.9 |  |  |
Interest expense |  | 0.5 |  |  | 0.9 | 0.9 | 2.1 |  |  |
Total expenses |  | 85.8 |  |  | 74.3 | 177.9 | 162.8 |  |  |
Net income from discontinued operations, net of tax |  | 3.4 |  |  | 17.0 | 35.7 | 64.4 |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (0.6) |  |  | 366.6 | (1.6) | 366.6 |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  | 0.6 |  |  | (0.2) | 1.4 | (0.1) |  |  |
Total comprehensive income |  | 16.3 |  |  | 449.2 | 51.5 | 499.5 |  |  |
Sirius Group |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Total investments |  |  |  |  |  |  |  |  |  | $ 686.2
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net realized and unrealized investment gains |  |  |  |  | 0.4 |  | 3.7 |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (0.6) |  | $ 4.0 |  |  |  | 363.2 |  |
Tranzact |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Income tax benefit (expense) | $ 30.2 |  |  |  |  |  |  | 30.2 |  |
Net (loss) gain on sale of discontinued operations, net of tax | $ 51.9 |  | $ (1.0) |  |  |  |  | 51.9 |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts receivable on unsettled investment sales |  | 5.8 |  |  |  | 5.8 |  | 1.4 |  |
Disposal Group, Including Discontinued Operation, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Accounts payable on unsettled investment purchases |  | 9.3 |  |  |  | 9.3 |  | 0.0 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | 277.4 |  |  | 309.1 | 539.2 | 790.1 |  |  |
Net investment income |  | 14.5 |  |  | 14.3 | 26.7 | 40.9 |  |  |
Net realized and unrealized investment gains |  | 12.3 |  |  | 32.0 | 27.3 | 39.8 |  |  |
Other revenue |  | 2.1 |  |  | 52.5 | 5.5 | 107.1 |  |  |
Total revenues |  | 306.3 |  |  | 407.9 | 598.7 | 977.9 |  |  |
Loss and loss adjustment expenses |  | 188.6 |  |  | 220.9 | 339.2 | 493.4 |  |  |
Insurance acquisition expenses |  | 48.4 |  |  | 59.3 | 93.7 | 158.7 |  |  |
Other underwriting expenses |  | 59.6 |  |  | 55.1 | 111.3 | 137.1 |  |  |
General and administrative expenses |  | 8.8 |  |  | 52.9 | 13.8 | 118.3 |  |  |
Interest expense |  | 3.3 |  |  | 5.8 | 6.6 | 17.1 |  |  |
Total expenses |  | 308.7 |  |  | 394.0 | 564.6 | 924.6 |  |  |
Pre-tax (loss) income |  | (2.4) |  |  | 13.9 | 34.1 | 53.3 |  |  |
Income tax benefit (expense) |  | 5.8 |  |  | 3.1 | 1.6 | 11.1 |  |  |
Net income from discontinued operations, net of tax |  | 3.4 |  |  | 17.0 | 35.7 | 64.4 |  |  |
Total (loss) income from discontinued operations |  | 2.8 |  |  | 383.6 | 34.1 | 431.0 |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  | 0.2 |  |  | 108.3 | 0.3 | 145.5 |  |  |
Total comprehensive income |  | 3.0 |  |  | 491.9 | 34.4 | 576.5 |  |  |
Discontinued Operations | Net gain (loss) from sale of discontinued operations |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (0.6) |  |  | 366.6 | (1.6) | 366.6 |  |  |
Discontinued Operations | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value |  | 2,288.6 |  |  |  | 2,288.6 |  | 2,175.7 |  |
Short-term investments, at amortized cost (which approximates fair value) |  | 55.5 |  |  |  | 55.5 |  | 112.3 |  |
Common equity securities, at fair value |  | 205.5 |  |  |  | 205.5 |  | 188.7 |  |
Other long-term investments |  | 134.1 |  |  |  | 134.1 |  | 150.5 |  |
Total investments |  | 2,683.7 |  |  |  | 2,683.7 |  | 2,627.2 |  |
Cash |  | 71.3 |  |  |  | 71.3 |  | 70.5 |  |
Reinsurance recoverable on unpaid and paid losses |  | 198.0 |  |  |  | 198.0 |  | 179.8 |  |
Insurance premiums receivable |  | 245.4 |  |  |  | 245.4 |  | 229.8 |  |
Deferred acquisition costs |  | 106.9 |  |  |  | 106.9 |  | 96.3 |  |
Deferred tax asset |  | 130.1 |  |  |  | 130.1 |  | 126.7 |  |
Ceded unearned insurance and reinsurance premiums |  | 56.6 |  |  |  | 56.6 |  | 44.2 |  |
Goodwill and other intangible assets |  | 0.6 |  |  |  | 0.6 |  | 1.2 |  |
Other assets |  | 198.0 |  |  |  | 198.0 |  | 222.4 |  |
Total assets held for sale |  | 3,696.4 |  |  |  | 3,696.4 |  | 3,599.5 |  |
Disposal Group, Including Discontinued Operation, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Loss and loss adjustment expense reserves |  | 1,411.2 |  |  |  | 1,411.2 |  | 1,370.6 |  |
Unearned insurance premiums |  | 595.2 |  |  |  | 595.2 |  | 576.3 |  |
Debt |  | 273.3 |  |  |  | 273.3 |  | 273.2 |  |
Accrued incentive compensation |  | 39.5 |  |  |  | 39.5 |  | 44.3 |  |
Funds held under reinsurance treaties |  | 210.2 |  |  |  | 210.2 |  | 153.0 |  |
Other liabilities |  | 140.1 |  |  |  | 140.1 |  | 151.9 |  |
Total liabilities held for sale |  | 2,678.8 |  |  |  | 2,678.8 |  | 2,569.3 |  |
Discontinued Operations | Sirius Group |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Net Assets |  | 1,017.6 |  |  |  | 1,017.6 |  | 1,030.2 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | 0.0 |  |  | 37.7 |  | 240.1 |  |  |
Net investment income |  | 0.0 |  |  | 2.2 |  | 14.4 |  |  |
Net realized and unrealized investment gains |  | 0.0 |  |  | 7.3 |  | (1.5) |  |  |
Other revenue |  | 0.0 |  |  | 4.7 |  | 0.6 |  |  |
Total revenues |  | 0.0 |  |  | 51.9 |  | 253.6 |  |  |
Loss and loss adjustment expenses |  | 0.0 |  |  | 41.2 |  | 154.9 |  |  |
Insurance acquisition expenses |  | 0.0 |  |  | 10.6 |  | 59.0 |  |  |
Other underwriting expenses |  | 0.0 |  |  | 4.2 |  | 30.9 |  |  |
General and administrative expenses |  | 0.0 |  |  | 2.3 |  | 10.4 |  |  |
Interest expense |  | 0.0 |  |  | 1.3 |  | 7.9 |  |  |
Total expenses |  | 0.0 |  |  | 59.6 |  | 263.1 |  |  |
Pre-tax (loss) income |  | 0.0 |  |  | (7.7) |  | (9.5) |  |  |
Income tax benefit (expense) |  | 0.0 |  |  | 2.2 |  | 3.1 |  |  |
Net income from discontinued operations, net of tax |  | 0.0 |  |  | (5.5) |  | (6.4) |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (0.6) |  |  |  |  |  |  |  |
Total (loss) income from discontinued operations |  | (0.6) |  |  | 361.1 | (0.6) | 360.2 |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  |  |  |  | (5.2) |  | 32.0 |  |  |
Total comprehensive income |  | (0.6) |  |  | 469.2 | (0.6) | 505.5 |  |  |
Discontinued Operations | Sirius Group | Net gain (loss) from sale of discontinued operations |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | (0.6) |  |  | 366.6 | (0.6) | 366.6 |  |  |
Discontinued Operations | OneBeacon |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | 277.4 |  |  | 271.4 | 539.2 | 550.0 |  |  |
Net investment income |  | 14.5 |  |  | 12.1 | 26.7 | 26.5 |  |  |
Net realized and unrealized investment gains |  | 12.3 |  |  | 24.7 | 27.3 | 41.3 |  |  |
Other revenue |  | 2.1 |  |  | 0.8 | 5.5 | 1.7 |  |  |
Total revenues |  | 306.3 |  |  | 309.0 | 598.7 | 619.5 |  |  |
Loss and loss adjustment expenses |  | 188.6 |  |  | 179.7 | 339.2 | 338.5 |  |  |
Insurance acquisition expenses |  | 48.4 |  |  | 48.7 | 93.7 | 99.7 |  |  |
Other underwriting expenses |  | 59.6 |  |  | 50.9 | 111.3 | 106.2 |  |  |
General and administrative expenses |  | 8.8 |  |  | 3.5 | 13.8 | 7.4 |  |  |
Interest expense |  | 3.3 |  |  | 3.2 | 6.6 | 6.5 |  |  |
Total expenses |  | 308.7 |  |  | 286.0 | 564.6 | 558.3 |  |  |
Pre-tax (loss) income |  | (2.4) |  |  | 23.0 | 34.1 | 61.2 |  |  |
Income tax benefit (expense) |  | 5.8 |  |  | 2.0 | 1.6 | 10.1 |  |  |
Net income from discontinued operations, net of tax |  | 3.4 |  |  | 25.0 | 35.7 | 71.3 |  |  |
Total (loss) income from discontinued operations |  | 3.4 |  |  | 25.0 | 35.7 | 71.3 |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  | 0.2 |  |  | 0.2 | 0.3 | 0.2 |  |  |
Total comprehensive income |  | 3.6 |  |  | 25.2 | 36.0 | 71.5 |  |  |
Discontinued Operations | Other Discontinued Operations |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Earned insurance premiums |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net investment income |  |  |  |  | 0.0 |  | 0.0 |  |  |
Net realized and unrealized investment gains |  |  |  |  | 0.0 |  | 0.0 |  |  |
Other revenue |  |  |  |  | 47.0 |  | 104.8 |  |  |
Total revenues |  |  |  |  | 47.0 |  | 104.8 |  |  |
Loss and loss adjustment expenses |  |  |  |  | 0.0 |  | 0.0 |  |  |
Insurance acquisition expenses |  |  |  |  | 0.0 |  | 0.0 |  |  |
Other underwriting expenses |  |  |  |  | 0.0 |  | 0.0 |  |  |
General and administrative expenses |  |  |  |  | 47.1 |  | 100.5 |  |  |
Interest expense |  |  |  |  | 1.3 |  | 2.7 |  |  |
Total expenses |  |  |  |  | 48.4 |  | 103.2 |  |  |
Pre-tax (loss) income |  |  |  |  | (1.4) |  | 1.6 |  |  |
Income tax benefit (expense) |  |  |  |  | (1.1) |  | (2.1) |  |  |
Net income from discontinued operations, net of tax |  |  |  |  | (2.5) |  | (0.5) |  |  |
Total (loss) income from discontinued operations |  |  |  |  | (2.5) |  | (0.5) |  |  |
Total comprehensive income |  |  |  |  | (2.5) |  | (0.5) |  |  |
Discontinued Operations | Total |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  | $ 0.2 |  |  | (5.0) | 0.3 | 32.2 |  |  |
Discontinued Operations | Tranzact |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Income tax benefit (expense) |  |  |  |  |  |  |  | $ 8.8 |  |
Net income from discontinued operations, net of tax |  |  |  |  | (2.5) |  | (0.5) |  |  |
Total (loss) income from discontinued operations |  |  |  |  |  | (1.0) |  |  |  |
Total comprehensive income |  |  |  |  |  | (1.0) |  |  |  |
Discontinued Operations | Tranzact | Net gain (loss) from sale of discontinued operations |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  |  |  |  |  | $ (1.0) |  |  |  |
Discontinued Operations | Sale of Sirius Group |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Net change in foreign currency translation and benefit plan assets and obligations |  |  |  |  | $ 113.3 |  | $ 113.3 |  |  |

X
- Definition Amount of other assets held-for-sale that are not part of a disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6390208&loc=d3e400-110220 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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