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Discontinued Operations - Financial Statement Disclosures (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |
Fixed maturity investments, at fair value | $ 4,175.4 |  |  |  | $ 4,250.2 |
Short-term investments, at amortized cost (which approximates fair value) | 230.9 |  |  |  | 287.0 |
Common equity securities, at fair value | 601.0 |  |  |  | 474.3 |
Other long-term investments | 331.7 |  |  |  | 323.3 |
Total investments | 5,339.0 |  |  |  | 5,334.8 |
Cash | 125.0 |  |  |  | 149.8 |
Reinsurance recoverable on unpaid losses | 174.7 |  |  |  | 172.9 |
Reinsurance recoverable on paid losses | 3.4 |  |  |  | 6.6 |
Insurance premiums receivable | 227.5 |  |  |  | 229.9 |
Deferred acquisition costs | 110.4 |  |  |  | 106.9 |
Deferred tax asset | 125.5 |  |  |  | 126.7 |
Ceded unearned insurance premiums | 52.4 |  |  |  | 44.2 |
Accounts receivable on unsettled investment sales | 24.5 |  |  |  | 6.2 |
Goodwill and other intangible assets | 53.0 |  | $ 56.3 |  | 55.9 | $ 55.4
Other assets | (254.3) |  |  |  | (274.6) |
Assets held for sale | 0.0 |  |  |  | 10.1 |
Loss and loss adjustment expense reserves | 1,368.8 |  | 1,343.8 |  | 1,365.6 | 1,389.8
Unearned insurance premiums | 678.1 |  |  |  | 658.0 |
Debt | 284.7 |  |  |  | 285.9 |
Accrued incentive compensation | 83.2 |  |  |  | 140.0 |
Funds held under insurance contracts | 148.7 |  |  |  | 153.0 |
Accounts payable on unsettled investment purchases | 17.3 |  |  |  | 0.0 |
Other liabilities | 178.5 |  |  |  | 199.9 |
Total liabilities held for sale | 0.0 |  |  |  | 5.1 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Earned insurance premiums | 264.8 |  | 282.1 |  |  |
Net investment income | 26.1 |  | 17.9 |  |  |
Net realized and unrealized investment gains | 51.3 |  | 29.5 |  |  |
Total revenues | 385.9 |  | 369.3 |  |  |
Loss and loss adjustment expenses | 151.7 |  | 161.1 |  |  |
Insurance Acquisition Expenses | 46.6 |  | 52.7 |  |  |
Other Underwriting Expense | 51.8 |  | 55.4 |  |  |
General and administrative expenses | 94.2 |  | 87.1 |  |  |
Interest expense | 3.7 |  | 4.5 |  |  |
Total expenses | 348.0 |  | 360.8 |  |  |
Net (loss) income from discontinued operations | 0.0 |  | (1.1) |  |  |
Net (loss) gain on sale of discontinued operations, net of tax | (1.0) |  | 0.0 |  |  |
Net change in foreign currency translation | 0.9 |  | 0.1 |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Cash balances at beginning of period | 149.8 |  | 167.2 |  | 167.2 |
Cash balances at end of period | 125.0 |  | 165.3 |  | 149.8 |
Net income tax payment (refund) from national governments | 0.0 |  | (13.5) |  |  |
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 |  |  | 4.1 |  |  |
Net (loss) gain on sale of discontinued operations, net of tax |  | $ 4.0 |  |  | 363.2 |
Net change in foreign currency translation | 0.0 |  | 37.2 |  |  |
Tranzact [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | 30.2 |  |  | 30.2 |
Net (loss) gain on sale of discontinued operations, net of tax | (1.0) | $ 51.9 |  |  | 51.9 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Net Change in Cash Reclassified to Assets Held-for-sale | (0.9) |  | 0.9 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Earned insurance premiums | 0.0 |  | 202.4 |  |  |
Net investment income | 0.0 |  | 12.2 |  |  |
Net realized and unrealized investment gains | 0.0 |  | (8.8) |  |  |
Other revenue | 0.0 |  | 53.7 |  |  |
Total revenues | 0.0 |  | 259.5 |  |  |
Loss and loss adjustment expenses | 0.0 |  | 113.7 |  |  |
Insurance Acquisition Expenses | 0.0 |  | 48.4 |  |  |
Other Underwriting Expense | 0.0 |  | 26.7 |  |  |
General and administrative expenses | 0.0 |  | 61.5 |  |  |
Interest expense | 0.0 |  | 8.0 |  |  |
Total expenses | 0.0 |  | 258.3 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | 0.0 |  | 1.2 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 0.0 |  | (0.1) |  |  |
Net (loss) income from discontinued operations | 0.0 |  | (1.1) |  |  |
Net loss from discontinued operations, net of tax | (1.0) |  | 1.1 |  |  |
Net change in foreign currency translation | 0.0 |  | 37.2 |  |  |
Total comprehensive income | (1.0) |  | 38.3 |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Net cash used for operations - discontinued operations | 0.0 |  | (40.7) |  |  |
Net cash provided from investing activities - discontinued operations | 0.0 |  | 33.6 |  |  |
Net cash used for financing activities - discontinued operations | 0.0 |  | (8.3) |  |  |
Effect of exchange rate changes on cash | 0.0 |  | 4.2 |  |  |
Net change in cash during the period | 0.0 |  | (11.2) |  |  |
Cash balances at beginning of period | 0.0 |  | 150.2 |  | 150.2 |
Cash balances at end of period | 0.0 |  | 139.9 |  | 0.0 |
Interest paid | 0.0 |  | 1.4 |  |  |
Net income tax payment (refund) from national governments | 0.0 |  | (36.4) |  |  |
Discontinued Operations [Member] | Discontinued Operations, Held-for-sale |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |
Fixed maturity investments, at fair value |  |  |  |  | 6.6 |
Short-term investments, at amortized cost (which approximates fair value) |  |  |  |  | 0.2 |
Total investments |  |  |  |  | 6.8 |
Cash |  |  |  |  | 0.9 |
Reinsurance recoverable on unpaid losses |  |  |  |  | 0.3 |
Insurance premiums receivable |  |  |  |  | 1.5 |
Other assets |  |  |  |  | (0.6) |
Assets held for sale |  |  |  |  | 10.1 |
Loss and loss adjustment expense reserves |  |  |  |  | 5.0 |
Unearned insurance premiums |  |  |  |  | 1.2 |
Other liabilities |  |  |  |  | 1.1 |
Total liabilities held for sale |  |  |  |  | 5.1 |
Discontinued Operations [Member] | Sirius Group |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets [Abstract] |  |  |  |  |  |
Net Assets |  |  |  |  | 5.0 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Earned insurance premiums | 0.0 |  | 202.4 |  |  |
Net investment income | 0.0 |  | 12.2 |  |  |
Net realized and unrealized investment gains | 0.0 |  | (8.8) |  |  |
Other revenue | 0.0 |  | (4.1) |  |  |
Total revenues | 0.0 |  | 201.7 |  |  |
Loss and loss adjustment expenses | 0.0 |  | 113.7 |  |  |
Insurance Acquisition Expenses | 0.0 |  | 48.4 |  |  |
Other Underwriting Expense | 0.0 |  | 26.7 |  |  |
General and administrative expenses | 0.0 |  | 8.1 |  |  |
Interest expense | 0.0 |  | 6.6 |  |  |
Total expenses | 0.0 |  | 203.5 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | 0.0 |  | (1.8) |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 0.0 |  | 0.9 |  |  |
Net (loss) income from discontinued operations | 0.0 |  | 0.9 |  |  |
Net loss from discontinued operations, net of tax | 0.0 |  | (0.9) |  |  |
Net change in foreign currency translation | 0.0 |  | 37.2 |  |  |
Total comprehensive income | 0.0 |  | 36.3 |  |  |
Discontinued Operations [Member] | Tranzact [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  | (8.8) |
Net (loss) income from discontinued operations |  |  | 2.0 |  |  |
Discontinued Operations [Member] | Tranzact [Member] | Net gain (loss) from sale of discontinued operations [Member] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Net (loss) gain on sale of discontinued operations, net of tax | (1.0) |  |  |  |  |
Discontinued Operations [Member] | Other Discontinued Operations [Member] |  |  |  |  |  |
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 | 0.0 |  | 57.8 |  |  |
Total revenues | 0.0 |  | 57.8 |  |  |
Loss and loss adjustment expenses | 0.0 |  | 0.0 |  |  |
Insurance Acquisition Expenses | 0.0 |  | 0.0 |  |  |
Other Underwriting Expense | 0.0 |  | 0.0 |  |  |
General and administrative expenses | 0.0 |  | 53.4 |  |  |
Interest expense | 0.0 |  | 1.4 |  |  |
Total expenses | 0.0 |  | 54.8 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | 0.0 |  | 3.0 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation | 0.0 |  | (1.0) |  |  |
Net (loss) income from discontinued operations | 0.0 |  | (2.0) |  |  |
Net loss from discontinued operations, net of tax | (1.0) |  | 2.0 |  |  |
Total comprehensive income | (1.0) |  | 2.0 |  |  |
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 (loss) gain on sale of discontinued operations, net of tax |  |  |  | $ 0.0 |  |
Discontinued Operations, Held-for-sale |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Cash balances at beginning of period | 0.9 |  | 150.2 |  | 150.2 |
Cash balances at end of period | $ 0.0 |  | $ 139.9 |  | $ 0.9 |

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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 the cost of borrowed funds accounted for as interest expense for debt. + 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 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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