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Discontinued Operations - Financial Statement Disclosures (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 60 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value | $ 4,131.5 |  |  | $ 4,131.5 |  | $ 4,131.5 | $ 2,630.2 |  |
Short-term investments, at amortized cost (which approximates fair value) | 305.6 |  |  | 305.6 |  | 305.6 | 211.2 |  |
Common equity securities, at fair value | 425.0 |  |  | 425.0 |  | 425.0 | 1,113.9 |  |
Other long-term investments | 351.4 |  |  | 351.4 |  | 351.4 | 315.8 |  |
Total investments | 5,213.5 |  |  | 5,213.5 |  | 5,213.5 | 4,271.1 |  |
Cash | 244.7 |  |  | 244.7 |  | 244.7 | 173.0 |  |
Reinsurance recoverable on unpaid losses | 169.4 |  |  | 169.4 |  | 169.4 | 186.0 |  |
Reinsurance recoverable on paid losses | 16.4 |  |  | 16.4 |  | 16.4 | 7.5 |  |
Insurance premiums receivable | 264.6 |  |  | 264.6 |  | 264.6 | 220.3 |  |
Deferred acquisition costs | 109.6 |  |  | 109.6 |  | 109.6 | 107.6 |  |
Deferred tax asset | 119.5 |  |  | 119.5 |  | 119.5 | 112.8 |  |
Ceded unearned insurance premiums | 35.1 |  |  | 35.1 |  | 35.1 | 29.5 |  |
Accounts receivable on unsettled investment sales | 179.0 |  |  | 179.0 |  | 179.0 | 41.9 |  |
Goodwill and other intangible assets | 59.3 | $ 53.3 | $ 58.0 | 59.3 | $ 58.0 | 59.3 | 55.4 | $ 60.5 | $ 62.5
Other assets | 226.3 |  |  | 226.3 |  | 226.3 | 273.2 |  |
Assets held for sale | 27.0 |  |  | 27.0 |  | 27.0 | 4,790.4 |  |
Loss and loss adjustment expense reserves | 1,362.0 | 1,376.6 | 1,427.4 | 1,362.0 | 1,427.4 | 1,362.0 | 1,389.8 | $ 1,350.8 | $ 1,342.2
Unearned insurance premiums | 674.1 |  |  | 674.1 |  | 674.1 | 610.5 |  |
Debt | 288.5 |  |  | 288.5 |  | 288.5 | 337.6 |  |
Accrued incentive compensation | 124.2 |  |  | 124.2 |  | 124.2 | 140.7 |  |
Ceded reinsurance payable | 28.2 |  |  | 28.2 |  | 28.2 | 29.9 |  |
Funds held under insurance contracts | 156.2 |  |  | 156.2 |  | 156.2 | 137.8 |  |
Accounts payable on unsettled investment purchases | 30.0 |  |  | 30.0 |  | 30.0 | 0.0 |  |
Other liabilities | 210.9 |  |  | 210.9 |  | 210.9 | 220.9 |  |
Total liabilities held for sale | 7.8 |  |  | 7.8 |  | 7.8 | 3,047.4 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Earned insurance premiums | 281.3 |  | 284.9 | 838.1 | 896.0 |  |  |  |
Net investment income | 22.5 |  | 16.8 | 59.6 | 42.6 |  |  |  |
Net realized and unrealized investment gains (losses) | 26.4 |  | (43.9) | 84.0 | (33.9) |  |  |  |
Other revenue | 34.8 |  | 38.3 | 110.8 | 114.4 |  |  |  |
Total revenues | 365.0 |  | 296.1 | 1,092.5 | 1,019.1 |  |  |  |
Loss and loss adjustment expenses | 165.0 |  | 170.0 | 508.1 | 534.1 |  |  |  |
Insurance and Reinsurance Acquisition Expenses | 56.4 |  | 55.3 | 159.2 | 166.1 |  |  |  |
Other Underwriting Expense | 49.6 |  | 56.5 | 156.0 | 165.5 |  |  |  |
General and administrative expenses | 70.2 |  | 97.3 | 230.4 | 231.6 |  |  |  |
Interest expense | 3.8 |  | 3.9 | 12.4 | 10.8 |  |  |  |
Total expenses | 345.0 |  | 383.0 | 1,066.1 | 1,108.1 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | 7.1 | 59.1 |  |  |  |
Net gain on sale of discontinued operations |  |  |  | 414.5 | 18.2 |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Cash balances at beginning of period |  |  |  | 167.2 | 232.9 |  |  |  |
Cash balances at end of period | 244.7 |  | 173.0 | 244.7 | 173.0 | 244.7 |  |  |
Net income tax refund from national governments |  |  |  | (13.5) | (8.0) |  |  |  |
Net change in foreign currency translation | 0.2 |  | 0.1 | 0.3 | 0.3 |  |  |  |
Total comprehensive income (loss) | 91.9 |  | (73.8) | 591.4 | (61.5) |  |  |  |
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 (losses) |  |  | 0.8 | 3.7 | 3.5 |  |  |  |
Net gain on sale of discontinued operations | (4.0) | 366.6 | 0.0 | 362.6 | 0.0 |  |  |  |
Tranzact [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 30.2 |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 51.9 |  |  |  |  |  |  |  |
Esurance |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  |  | 10.3 |  | 18.2 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash Reclassified to Assets Held-for-sale |  |  |  | 2.6 |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Cash sold as part of sale of subsidiaries | 345.8 |  |  | 345.8 |  | 345.8 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash Reclassified to Assets Held-for-sale | 345.8 |  |  | 345.8 |  | 345.8 |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Earned insurance premiums | 0.0 |  | 202.8 | 240.1 | 623.3 |  |  |  |
Net investment income | 0.0 |  | 10.5 | 14.4 | 28.6 |  |  |  |
Net realized and unrealized investment gains (losses) | 0.0 |  | (0.9) | (1.5) | 31.4 |  |  |  |
Other revenue | 14.8 |  | 40.3 | 120.2 | 90.4 |  |  |  |
Total revenues | 14.8 |  | 252.7 | 373.2 | 773.7 |  |  |  |
Loss and loss adjustment expenses | 0.0 |  | 121.7 | 154.9 | 311.3 |  |  |  |
Insurance and Reinsurance Acquisition Expenses | 0.0 |  | 45.4 | 59.0 | 135.5 |  |  |  |
Other Underwriting Expense | 0.0 |  | 24.8 | 30.9 | 78.0 |  |  |  |
General and administrative expenses | 16.2 |  | 54.7 | 127.1 | 144.9 |  |  |  |
Interest expense | 0.5 |  | 7.6 | 11.1 | 22.7 |  |  |  |
Total expenses | 16.7 |  | 254.2 | 383.0 | 692.4 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (1.9) |  | (1.5) | (9.8) | 81.3 |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 15.9 |  | (2.3) | 16.9 | (22.2) |  |  |  |
Net gain on sale of discontinued operations | 14.0 |  | (3.8) | 7.1 | 59.1 |  |  |  |
Net loss from discontinued operations, net of tax | 61.9 |  | 6.5 | 421.6 | 77.3 |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Net cash (used for) provided from operations - discontinued operations |  |  |  | (16.2) | 22.7 |  |  |  |
Net cash provided from investing activities - discontinued operations |  |  |  | 213.3 | 2.8 |  |  |  |
Net cash (used for) provided from financing activities - discontinued operations |  |  |  | (0.2) | 19.6 |  |  |  |
Effect of exchange rate changes on cash |  |  |  | 0.0 | (4.1) |  |  |  |
Net change in cash during the period |  |  |  | 196.9 | 41.0 |  |  |  |
Cash balances at beginning of period |  |  |  | 150.1 | 116.6 |  |  |  |
Cash balances at end of period | 0.0 |  | 157.6 | 0.0 | 157.6 | 0.0 |  |  |
Interest paid |  |  |  | (1.4) | (28.1) |  |  |  |
Net income tax refund from national governments |  |  |  | (31.8) | (30.3) |  |  |  |
Net change in foreign currency translation | 0.0 |  | (18.5) |  | (62.1) |  |  |  |
Total comprehensive income (loss) | 61.9 |  | (12.0) | 566.9 | 15.2 |  |  |  |
Discontinued Operations [Member] | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | (4.0) |  |  | 362.6 |  |  |  |  |
Discontinued Operations [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value | 13.4 |  |  | 13.4 |  | 13.4 | 2,383.5 |  |
Short-term investments, at amortized cost (which approximates fair value) | 1.3 |  |  | 1.3 |  | 1.3 | 352.1 |  |
Common equity securities, at fair value | 0.0 |  |  | 0.0 |  | 0.0 | 174.4 |  |
Other long-term investments | 0.0 |  |  | 0.0 |  | 0.0 | 72.2 |  |
Total investments | 14.7 |  |  | 14.7 |  | 14.7 | 2,982.2 |  |
Cash | 3.8 |  |  | 3.8 |  | 3.8 | 150.1 |  |
Reinsurance recoverable on unpaid losses | 0.6 |  |  | 0.6 |  | 0.6 | 283.6 |  |
Reinsurance recoverable on paid losses | 0.0 |  |  | 0.0 |  | 0.0 | 10.2 |  |
Insurance premiums receivable | 2.0 |  |  | 2.0 |  | 2.0 | 326.6 |  |
Deferred acquisition costs | 0.0 |  |  | 0.0 |  | 0.0 | 74.6 |  |
Deferred tax asset | 0.0 |  |  | 0.0 |  | 0.0 | 303.1 |  |
Ceded unearned insurance premiums | 0.0 |  |  | 0.0 |  | 0.0 | 87.7 |  |
Goodwill and other intangible assets | 5.2 |  |  | 5.2 |  | 5.2 | 330.5 |  |
Other assets | 0.7 |  |  | 0.7 |  | 0.7 | 212.8 |  |
Assets held for sale | 27.0 |  |  | 27.0 |  | 27.0 | 4,790.4 |  |
Loss and loss adjustment expense reserves | 6.0 |  |  | 6.0 |  | 6.0 | 1,650.4 |  |
Unearned insurance premiums | 1.6 |  |  | 1.6 |  | 1.6 | 344.3 |  |
Debt | 0.0 |  |  | 0.0 |  | 0.0 | 506.4 |  |
Deferred tax liability | 0.0 |  |  | 0.0 |  | 0.0 | 270.6 |  |
Accrued incentive compensation | 0.0 |  |  | 0.0 |  | 0.0 | 64.2 |  |
Ceded reinsurance payable | (0.5) |  |  | (0.5) |  | (0.5) | 67.7 |  |
Funds held under insurance contracts | 0.0 |  |  | 0.0 |  | 0.0 | 52.9 |  |
Other liabilities | 0.7 |  |  | 0.7 |  | 0.7 | 90.9 |  |
Total liabilities held for sale | 7.8 |  |  | 7.8 |  | 7.8 | 3,047.4 |  |
Discontinued Operations [Member] | Sirius Group |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |
Accounts receivable on unsettled investment sales | 0.0 |  |  | 0.0 |  | 0.0 | 29.0 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Earned insurance premiums |  | 0.0 | 202.8 | 240.1 | 623.3 |  |  |  |
Net investment income |  | 0.0 | 10.5 | 14.4 | 28.6 |  |  |  |
Net realized and unrealized investment gains (losses) |  | 0.0 | (0.9) | (1.5) | 31.4 |  |  |  |
Other revenue |  | 0.0 | 1.8 | 0.6 | (20.2) |  |  |  |
Total revenues |  | 0.0 | 214.2 | 253.6 | 663.1 |  |  |  |
Loss and loss adjustment expenses |  | 0.0 | 121.7 | 154.9 | 311.3 |  |  |  |
Insurance and Reinsurance Acquisition Expenses |  | 0.0 | 45.4 | 59.0 | 135.5 |  |  |  |
Other Underwriting Expense |  | 0.0 | 24.8 | 30.9 | 78.0 |  |  |  |
General and administrative expenses |  | 0.0 | 9.4 | 10.4 | 22.4 |  |  |  |
Interest expense |  | 0.0 | 6.6 | 7.9 | 20.0 |  |  |  |
Total expenses |  | 0.0 | 207.9 | 263.1 | 567.2 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  | 0.0 | 6.3 | (9.5) | 95.9 |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | 0.0 | (2.3) | 3.1 | (22.2) |  |  |  |
Net gain on sale of discontinued operations |  | 0.0 | 4.0 | (6.4) | 73.7 |  |  |  |
Net loss from discontinued operations, net of tax |  | (4.0) | 4.0 | 356.2 | 73.7 |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Net Assets | 19.2 |  |  | 19.2 |  | 19.2 | $ 1,743.0 |  |
Net change in foreign currency translation |  | 0.0 | (18.5) | 32.0 | (62.1) |  |  |  |
Total comprehensive income (loss) |  | (4.0) | (14.5) | 501.5 | 11.6 |  |  |  |
Discontinued Operations [Member] | Sirius Group | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  | $ (4.0) |  | 362.6 |  |  |  |  |
Discontinued Operations [Member] | Tranzact [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |  |
Other liabilities | 2.8 |  |  | 2.8 |  | 2.8 |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | (16.1) |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Tranzact [Member] | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  |  |  | 51.9 |  |  |  |  |
Discontinued Operations [Member] | Other Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Earned insurance premiums | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Net investment income | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Net realized and unrealized investment gains (losses) | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Other revenue | 14.8 |  | 38.5 | 119.6 | 110.6 |  |  |  |
Total revenues | 14.8 |  | 38.5 | 119.6 | 110.6 |  |  |  |
Loss and loss adjustment expenses | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Insurance and Reinsurance Acquisition Expenses | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
Other Underwriting Expense | 0.0 |  | 0.0 | 0.0 | 0.0 |  |  |  |
General and administrative expenses | 16.2 |  | 45.3 | 116.7 | 122.5 |  |  |  |
Interest expense | 0.5 |  | 1.0 | 3.2 | 2.7 |  |  |  |
Total expenses | 16.7 |  | 46.3 | 119.9 | 125.2 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (1.9) |  | (7.8) | (0.3) | (14.6) |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 15.9 |  | 0.0 | 13.8 | 0.0 |  |  |  |
Net gain on sale of discontinued operations | 14.0 |  | (7.8) | 13.5 | (14.6) |  |  |  |
Net loss from discontinued operations, net of tax | 65.9 |  | 2.5 | 65.4 | 3.6 |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Total comprehensive income (loss) | 65.9 |  | 2.5 | 65.4 | 3.6 |  |  |  |
Discontinued Operations [Member] | Sale of Sirius Group [Member] |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Net change in foreign currency translation |  |  |  | 113.3 |  |  |  |  |
Discontinued Operations [Member] | OneBeacon Runoff [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  |  |  |  | 0.3 |  |  |  |
Net loss from discontinued operations, net of tax |  |  | (0.1) |  | (0.4) |  |  |  |
Discontinued Operations [Member] | OneBeacon Runoff [Member] | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 51.9 |  | 0.0 |  | 0.3 |  |  |  |
Discontinued Operations [Member] | Esurance |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 10.3 |  | 10.3 |  | 17.9 | 28.3 |  |  |
Discontinued Operations [Member] | Esurance | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 0.0 |  | 10.3 |  | 17.9 |  |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |
Cash balances at beginning of period |  |  |  | 150.1 | 116.6 |  |  |  |
Cash balances at end of period | $ 3.8 |  | $ 157.6 | $ 3.8 | $ 157.6 | $ 3.8 |  |  |

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- 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 Amount of net assets (liabilities). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09.6,7) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606914-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35686370&loc=SL35686385-199418 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05.4) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Paragraph 19 -Article 6 + Details
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- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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