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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |
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Sep. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Dec. 31, 2009 | Sep. 30, 2011 Sirius Group. | Sep. 30, 2010 Sirius Group. | Sep. 30, 2011 Sirius Group. | Sep. 30, 2010 Sirius Group. | Aug. 31, 2011 AutoOne OneBeacon Segment count | Sep. 30, 2011 Businesses classified as discontinued operations | Dec. 31, 2010 Businesses classified as discontinued operations
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income and realized and unrealized investment gains and losses previously included in the Esurance segment excluded from net income (loss) from discontinued operations |  |  |  |  |  |  | $ 0.9 | $ 0.9 | $ (2.4) | $ 3.7 |  |  |
Number of insurance entities (AOIC and AOSIC) sold under the agreement to sell the AutoOne business to Interboro (in counts) |  |  |  |  |  |  |  |  |  |  | 2 |  |
Assets held for sale |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity investments, at fair value | 5,287.7 |  | 5,786.1 |  |  |  |  |  |  |  |  | 585.0 | 593.8
Short-term investments, at amortized cost (which approximates fair value) | 772.8 |  | 975.3 |  |  |  |  |  |  |  |  | 224.9 | 131.0
Common equity securities, at fair value | 669.8 |  | 667.0 |  |  |  |  |  |  |  |  |  | 43.0
Convertible fixed maturity investments, at fair value | 140.5 |  | 143.0 |  |  |  |  |  |  |  |  |  | 17.2
Other long-term investments | 328.8 |  | 372.1 |  |  |  |  |  |  |  |  |  | 4.0
Total investments | 7,199.6 |  | 7,943.5 |  |  |  |  |  |  |  |  | 809.9 | 789.0
Cash | 557.7 |  | 395.0 |  |  |  |  |  |  |  |  | 235.7 | 39.8
Reinsurance recoverable on paid and unpaid losses |  |  |  |  |  |  |  |  |  |  |  | 34.6 | 34.4
Insurance premiums receivable | 644.8 |  | 532.5 |  |  |  |  |  |  |  |  | 128.2 | 102.9
Deferred acquisition costs | 202.9 |  | 176.1 |  |  |  |  |  |  |  |  | 42.8 | 34.7
Deferred tax asset | 431.7 |  | 431.9 |  |  |  |  |  |  |  |  | 88.2 | 67.8
Other assets | 760.2 |  | 730.0 |  |  |  |  |  |  |  |  | 60.1 | 54.2
Total assets | 14,581.7 |  | 14,534.1 |  |  |  |  |  |  |  |  | 1,399.5 | 1,122.8
Liabilities held for sale |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and loss adjustment expense reserves | 5,882.0 | 5,642.4 | 5,736.8 | 5,970.4 | 6,198.1 | 6,379.2 |  |  |  |  |  | 514.9 | 450.4
Unearned insurance premiums | 976.4 |  | 938.7 |  |  |  |  |  |  |  |  | 258.3 | 201.6
Accrued incentive compensation | 169.9 |  | 157.4 |  |  |  |  |  |  |  |  | 31.5 | 19.1
Other liabilities | 1,310.6 |  | 1,167.7 |  |  |  |  |  |  |  |  | 104.7 | 80.4
Total liabilities | 10,562.6 |  | 10,273.3 |  |  |  |  |  |  |  |  | 909.4 | 751.5
Net assets held for sale |  |  |  |  |  |  |  |  |  |  |  | $ 490.1 | $ 371.3

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- Definition Total common and preferred stock (which is not mandatorily redeemable, redeemable at the option of the holder, or in any other way classified as liability) equity 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 equity 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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: 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 3: 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 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(b)) -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 -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 7: 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 8: 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. Reference 9: 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 + Details
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- Definition Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 13 -Subparagraph a(2) Reference 2: 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),13(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 97 -Paragraph 16, 17, 20 -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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- Definition Aggregate carrying value as of the balance sheet date of liabilities for incentive compensation arrangements. + Details
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- Definition Represents the investment income and realized and unrealized investment gains and losses that had been previously included in the Esurance segment were excluded from net income (loss) from discontinued operations. + Details
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