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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  | 1 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 | Mar. 31, 2012 | Jan. 02, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Oct. 31, 2011 Esurance | Feb. 22, 2012 AutoOne Entity | Sep. 30, 2012 Segment, Discontinued Operations [Member] | Sep. 30, 2011 Segment, Discontinued Operations [Member] | Sep. 30, 2012 Segment, Discontinued Operations [Member] | Sep. 30, 2011 Segment, Discontinued Operations [Member] | Dec. 31, 2011 Segment, Discontinued Operations [Member] | Sep. 30, 2012 Segment, Discontinued Operations [Member] AutoOne | Sep. 30, 2012 Segment, Discontinued Operations [Member] AutoOne | Sep. 30, 2012 Loss attributable to change in discount rate [Member] | Sep. 30, 2012 OneBeacon Runoff [Member]
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of discontinued operation, net of tax | $ (91.0) | $ (18.2) | $ (91.0) | $ (18.2) |  |  |  |  |  |  |  | $ 677.5 |  | $ (91.0) | $ (18.2) | $ (91.0) | $ 18.2 |  | $ 0.1 | $ 0.5 |  | $ (91.5)
Number of insurance companies sold |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value | 4,912.4 |  | 4,912.4 |  |  |  |  | 6,221.9 |  |  |  |  |  | 377.3 |  | 377.3 |  | 111.8 |  |  |  |
Cash | 549.2 |  | 549.2 |  |  |  |  | 705.4 |  |  |  |  |  | 0 |  | 0 |  | 5.5 |  |  |  |
Reinsurance recoverable on unpaid losses | 356.8 | 2,581.2 | 356.8 | 2,581.2 |  | 2,369.4 |  | 2,507.3 |  | 2,193.0 | 2,344.0 |  |  | 1,956.6 |  | 1,956.6 |  | 0 |  |  |  |
Reinsurance recoverable on paid losses | 14.8 |  | 14.8 |  |  |  |  | 30.5 |  |  |  |  |  | 17.6 |  | 17.6 |  | 0 |  |  |  |
Insurance premiums receivable | 678.1 |  | 678.1 |  |  |  |  | 489.2 |  |  |  |  |  | 13.6 |  | 13.6 |  | 8.8 |  |  |  |
Deferred acquisition costs | 211.3 |  | 211.3 |  |  |  | 5.6 | 187.0 |  |  |  |  |  | 0 |  | 0 |  | 2.2 |  |  |  |
Deferred Income Tax Assets | 555.0 |  | 555.0 |  |  |  |  | 536.9 |  |  |  |  |  | 6.1 |  | 6.1 |  | 1.9 |  |  |  |
Other assets | 626.5 |  | 626.5 |  |  |  |  | 681.9 |  |  |  |  |  | 17.0 |  | 17.0 |  | 2.4 |  |  |  |
Total assets held for sale | 13,468.8 |  | 13,468.8 |  |  |  |  | 14,064.0 |  |  |  |  |  | 2,388.2 |  | 2,388.2 |  | 132.6 |  |  |  |
Liabilities held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and loss adjustment expense reserves | 3,059.8 | 5,882.0 | 3,059.8 | 5,882.0 | 5,329.8 |  |  | 5,702.3 | 5,642.4 |  | 5,736.8 |  |  | 2,212.9 |  | 2,212.9 |  | 64.7 |  |  |  |
Unearned insurance premiums | 1,067.1 |  | 1,067.1 |  |  |  |  | 846.9 |  |  |  |  |  | 0.6 |  | 0.6 |  | 34.1 |  |  |  |
Ceded reinsurance payable | 138.6 |  | 138.6 |  |  |  |  | 134.6 |  |  |  |  |  | 19.5 |  | 19.5 |  | 0 |  |  |  |
Other liabilities | 461.8 |  | 461.8 |  |  |  |  | 527.8 |  |  |  |  |  | 155.2 |  | 155.2 |  | 8.8 |  |  |  |
Total liabilities | 9,090.4 |  | 9,090.4 |  |  |  |  | 9,396.1 |  |  |  |  |  | 2,388.2 |  | 2,388.2 |  | 107.6 |  |  |  |
Net assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 25.0 |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | (106.8) | (30.2) | (115.5) | (26.0) |  |  |  |  | (100.5)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ (15.8) | $ (12.0) | $ (24.5) | $ (7.8) |  |  |  |  |  |  |  |  |  | $ (15.8) | $ (12.0) | $ (24.5) | $ (7.8) |  |  |  | $ (9.0) |

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- Definition Debt securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: 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),1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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