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Discontinued Operations - Financial Statement Disclosures (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |
Fixed maturity investments | $ 2,602.2 |  |  | $ 2,602.2 |  |  | $ 2,422.0 |
Short-term investments | 325.0 |  |  | 325.0 |  |  | 376.8 |
Common equity securities | 482.1 |  |  | 482.1 |  |  | 611.7 |
Convertible fixed maturity and preferred investments | 5.6 |  |  | 5.6 |  |  | 13.9 |
Other long-term investments | 294.6 |  |  | 294.6 |  |  | 318.0 |
Total investments | 3,709.5 |  |  | 3,709.5 |  |  | 3,742.4 |
Cash | 200.0 |  |  | 200.0 |  |  | 261.7 |
Reinsurance recoverable on unpaid losses | 214.6 |  |  | 214.6 |  |  | 161.7 |
Reinsurance recoverable on paid losses | 22.6 |  |  | 22.6 |  |  | 12.2 |
Insurance premiums receivable | 273.3 |  |  | 273.3 |  |  | 241.1 |
Funds held by ceding entities | 4.6 |  |  | 4.6 |  |  | 37.1 |
Deferred acquisition costs | 110.8 |  |  | 110.8 |  |  | 107.2 |
Deferred tax asset | 133.9 |  |  | 133.9 |  |  | 114.6 |
Ceded unearned insurance premiums | 41.4 |  |  | 41.4 |  |  | 17.8 |
Goodwill and intangible assets | 381.7 |  |  | 381.7 |  |  | 351.2 |
Other assets | 307.7 |  |  | 307.7 |  |  | 311.6 |
Assets held for sale | 4,528.1 |  |  | 4,528.1 |  |  | 4,630.6 |
Loss and loss adjustment expense reserves | 1,433.3 | $ 1,169.5 | $ 1,137.8 | 1,433.3 | $ 1,169.5 | $ 1,357.0 | 1,350.0 | $ 1,054.3
Unearned insurance premiums | 671.3 |  |  | 671.3 |  |  | 616.7 |
Debt | 383.3 |  |  | 383.3 |  |  | 343.1 |
Accrued incentive compensation | 121.0 |  |  | 121.0 |  |  | 108.1 |
Ceded reinsurance payable | 46.8 |  |  | 46.8 |  |  | 34.2 |
Funds held under insurance contracts | 100.3 |  |  | 100.3 |  |  | 81.0 |
Other liabilities | 304.9 |  |  | 304.9 |  |  | 278.4 |
Total liabilities held for sale | 3,032.8 |  |  | 3,032.8 |  |  | 3,105.3 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Earned insurance premiums | 284.9 | 307.2 |  | 896.0 | 879.1 |  |  |
Net investment income | 16.8 | 13.8 |  | 42.6 | 44.7 |  |  |
Net realized and unrealized investment (losses) gains | (43.9) | (27.5) |  | (33.9) | 64.4 |  |  |
Other revenue | 76.9 | 29.7 |  | 225.4 | 60.3 |  |  |
Total revenues | 334.7 | 323.2 |  | 1,130.1 | 1,048.5 |  |  |
Loss and loss adjustment expenses | 170.0 | 185.5 |  | 534.1 | 527.3 |  |  |
Insurance and Reinsurance Acquisition Expenses | 55.3 | 55.2 |  | 166.1 | 153.0 |  |  |
Other Underwriting Expense | 56.5 | 51.3 |  | 165.5 | 152.6 |  |  |
General and administrative expenses | 142.6 | 63.0 |  | 354.1 | 168.3 |  |  |
Interest expense | 4.9 | 3.7 |  | 13.5 | 10.6 |  |  |
Total expenses | 429.3 | 358.7 |  | 1,233.3 | 1,011.8 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | 73.3 | 166.8 |  |  |
Net gain on sale of discontinued operations | 10.3 | 7.0 |  | 18.2 | 9.7 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 0.0 | (0.2) |  | 0.3 | (0.1) |  |  |
Comprehensive (loss) income | (73.8) | (22.9) |  | (61.5) | 201.8 |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |
Net change in cash during the period |  |  |  | 17.5 | (27.6) |  |  |
Cash balances at beginning of period |  |  |  | 238.0 | 233.5 |  |  |
Cash balances at end of period | 183.2 | 395.4 |  | 183.2 | 395.4 |  |  |
Net income tax refund from national governments |  |  |  | (8.0) | (0.3) |  |  |
Sirius Group |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |
Total investments | 510.8 |  |  | 510.8 |  |  |  |
Fireman's Fund Insurance Company [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  | 14.0 |  |  |  |  |  |
OneBeacon Runoff [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  | 6.7 | 5.3 |  |  |  |  |
Esurance |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations |  |  |  |  | 3.2 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Earned insurance premiums | 202.8 | 231.7 |  | 623.3 | 656.6 |  |  |
Net investment income | 10.5 | 9.7 |  | 28.6 | 30.0 |  |  |
Net realized and unrealized investment (losses) gains | (0.9) | 48.3 |  | 31.4 | 134.1 |  |  |
Other revenue | 1.7 | 0.0 |  | (20.6) | (47.3) |  |  |
Total revenues | 214.2 | 266.9 |  | 662.7 | 773.4 |  |  |
Loss and loss adjustment expenses | 121.7 | 103.6 |  | 311.3 | 273.1 |  |  |
Insurance and Reinsurance Acquisition Expenses | 45.4 | 50.2 |  | 135.5 | 146.4 |  |  |
Other Underwriting Expense | 24.8 | 30.5 |  | 78.0 | 93.9 |  |  |
General and administrative expenses | 9.4 | 6.3 |  | 22.4 | 21.6 |  |  |
Interest expense | 6.6 | 6.6 |  | 20.0 | 19.8 |  |  |
Total expenses | 207.9 | 197.2 |  | 567.2 | 554.8 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | 6.2 | 69.7 |  | 95.5 | 218.6 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | (2.3) | (12.8) |  | (22.2) | (51.8) |  |  |
Net gain on sale of discontinued operations | 3.9 | 56.9 | $ 2.7 | 73.3 | 166.8 |  |  |
Net loss from discontinued operations, net of tax | 14.2 | 63.9 |  | 91.5 | 176.5 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (18.4) | (64.1) |  | (62.1) | (99.9) |  |  |
Comprehensive (loss) income | (4.2) | (0.2) |  | 29.4 | 76.6 |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |  |  |
Net cash provided from operations - discontinued operations |  |  |  | 6.7 | 49.8 |  |  |
Net cash provided from investing activities - discontinued operations |  |  |  | 35.7 | 47.5 |  |  |
Net cash used for financing activities - discontinued operations |  |  |  | (2.4) | (55.6) |  |  |
Effect of exchange rate changes on cash |  |  |  | (4.1) | (10.6) |  |  |
Net change in cash during the period |  |  |  | 35.9 | 31.1 |  |  |
Cash balances at beginning of period |  |  |  | 111.5 | 93.2 |  |  |
Cash balances at end of period | 147.4 | 124.3 |  | 147.4 | 124.3 |  |  |
Interest paid |  |  |  | (25.5) | (34.9) |  |  |
Net income tax refund from national governments |  |  |  | (30.3) | 7.5 |  |  |
Discontinued Operations [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |
Fixed maturity investments | 2,394.3 |  |  | 2,394.3 |  |  | 2,362.3 |
Short-term investments | 360.5 |  |  | 360.5 |  |  | 494.9 |
Common equity securities | 164.3 |  |  | 164.3 |  |  | 189.9 |
Convertible fixed maturity and preferred investments | 0.0 |  |  | 0.0 |  |  | 6.6 |
Other long-term investments | 82.1 |  |  | 82.1 |  |  | 89.0 |
Total investments | 3,001.2 |  |  | 3,001.2 |  |  | 3,142.7 |
Cash | 147.4 |  |  | 147.4 |  |  | 111.5 |
Reinsurance recoverable on unpaid losses | 276.5 |  |  | 276.5 |  |  | 322.2 |
Reinsurance recoverable on paid losses | 11.0 |  |  | 11.0 |  |  | 11.4 |
Insurance premiums receivable | 416.6 |  |  | 416.6 |  |  | 306.6 |
Funds held by ceding entities | 81.1 |  |  | 81.1 |  |  | 91.9 |
Deferred acquisition costs | 82.7 |  |  | 82.7 |  |  | 69.9 |
Deferred tax asset | 309.6 |  |  | 309.6 |  |  | 341.5 |
Ceded unearned insurance premiums | 118.4 |  |  | 118.4 |  |  | 76.2 |
Goodwill and intangible assets | 10.2 |  |  | 10.2 |  |  | 15.2 |
Other assets | 73.4 |  |  | 73.4 |  |  | 83.4 |
Assets held for sale | 4,528.1 |  |  | 4,528.1 |  |  | 4,630.6 |
Loss and loss adjustment expense reserves | 1,662.9 |  |  | 1,662.9 |  |  | 1,809.8 |
Unearned insurance premiums | 429.4 |  |  | 429.4 |  |  | 338.6 |
Debt | 403.5 |  |  | 403.5 |  |  | 403.5 |
Deferred tax liability | 257.8 |  |  | 257.8 |  |  | 282.8 |
Accrued incentive compensation | 55.5 |  |  | 55.5 |  |  | 76.5 |
Ceded reinsurance payable | 131.4 |  |  | 131.4 |  |  | 71.5 |
Funds held under insurance contracts | 45.1 |  |  | 45.1 |  |  | 57.9 |
Other liabilities | 47.2 |  |  | 47.2 |  |  | 64.7 |
Total liabilities held for sale | 3,032.8 |  |  | 3,032.8 |  |  | 3,105.3 |
Discontinued Operations [Member] | Sirius Group |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Earned insurance premiums | 202.8 | 231.4 |  | 623.3 | 656.5 |  |  |
Net investment income | 10.5 | 9.7 |  | 28.6 | 30.0 |  |  |
Net realized and unrealized investment (losses) gains | (0.9) | 48.3 |  | 31.4 | 134.1 |  |  |
Other revenue | 1.8 | (22.8) |  | (20.2) | (47.3) |  |  |
Total revenues | 214.2 | 266.6 |  | 663.1 | 773.3 |  |  |
Loss and loss adjustment expenses | 121.7 | 103.6 |  | 311.3 | 273.8 |  |  |
Insurance and Reinsurance Acquisition Expenses | 45.4 | 50.1 |  | 135.5 | 146.3 |  |  |
Other Underwriting Expense | 24.8 | 29.7 |  | 78.0 | 91.7 |  |  |
General and administrative expenses | 9.4 | 6.3 |  | 22.4 | 21.6 |  |  |
Interest expense | 6.6 | 6.6 |  | 20.0 | 19.8 |  |  |
Total expenses | 207.9 | 196.3 |  | 567.2 | 553.2 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | 6.3 | 70.3 |  | 95.9 | 220.1 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | (2.3) | (13.1) |  | (22.2) | (52.4) |  |  |
Net gain on sale of discontinued operations | 4.0 | 57.2 |  | 73.7 | 167.7 |  |  |
Net loss from discontinued operations, net of tax | 4.0 | 57.2 |  | 73.7 | 167.7 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (18.4) | (64.1) |  | (62.1) | (99.9) |  |  |
Comprehensive (loss) income | (14.4) | (6.9) |  | 11.6 | 67.8 |  |  |
Discontinued Operations [Member] | Other Discontinued Operations [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Earned insurance premiums | 0.0 | 0.3 |  | 0.0 | 0.1 |  |  |
Net investment income | 0.0 | 0.0 |  | 0.0 | 0.0 |  |  |
Net realized and unrealized investment (losses) gains | 0.0 | 0.0 |  | 0.0 | 0.0 |  |  |
Other revenue | (0.1) | 0.0 |  | (0.4) | 0.0 |  |  |
Total revenues | (0.1) | 0.3 |  | (0.4) | 0.1 |  |  |
Loss and loss adjustment expenses | 0.0 | 0.0 |  | 0.0 | (0.7) |  |  |
Insurance and Reinsurance Acquisition Expenses | 0.0 | 0.1 |  | 0.0 | 0.1 |  |  |
Other Underwriting Expense | 0.0 | 0.8 |  | 0.0 | 2.2 |  |  |
General and administrative expenses | 0.0 | 0.0 |  | 0.0 | 0.0 |  |  |
Interest expense | 0.0 | 0.0 |  | 0.0 | 0.0 |  |  |
Total expenses | 0.0 | 0.9 |  | 0.0 | 1.6 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (0.1) | (0.6) |  | (0.4) | (1.5) |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 0.0 | 0.3 |  | 0.0 | 0.6 |  |  |
Net gain on sale of discontinued operations | (0.1) | (0.3) |  | (0.4) | (0.9) |  |  |
Net loss from discontinued operations, net of tax | 10.2 | 6.7 |  | 17.8 | 8.8 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 0.0 | 0.0 |  | 0.0 | 0.0 |  |  |
Comprehensive (loss) income | 10.2 | 6.7 |  | 17.8 | 8.8 |  |  |
Discontinued Operations [Member] | OneBeacon | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |  |  |
Other assets | 0.0 |  |  | 0.0 |  |  | $ 58.1 |
Discontinued Operations [Member] | Fireman's Fund Insurance Company [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 0.0 | 14.0 |  | 0.0 | 14.0 |  |  |
Discontinued Operations [Member] | OneBeacon Runoff [Member] |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | 0.0 | (7.0) |  | 0.3 | (7.5) |  |  |
Discontinued Operations [Member] | Esurance |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |  |  |
Net gain on sale of discontinued operations | $ 10.3 | $ 0.0 |  | $ 17.9 | $ 3.2 |  |  |

X
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + 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 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(c)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prepaid Reinsurance Premiums -URI http://asc.fasb.org/extlink&oid=6521719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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- Definition The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(3),(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables on paid losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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