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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
SUPPLEMENTARY INSURANCE INFORMATION |  |  |  |  |  |
Deferred acquisition costs | $ 0 |  | $ 0 |  | $ 0 |
Future policy benefits, losses, claims and loss expenses | 0 |  | 0 |  | 0 |
Unearned premiums | 0 |  | 0 |  | 0 |
Other policy claims and benefits payable | 0 |  | 0 |  | 0 |
Premiums earned | 0 |  | 0 |  | 0 |
Benefits, claims, losses, and settlement expenses | 0 |  | 0 |  | 0 |
Amortization of deferred policy acquisition costs | 0 |  | 0 |  | 0 |
Other operating expenses | 0 |  | 0 |  | 0 |
Premiums written | 0 |  | 0 |  | 0 |
Net investment income of non-insurance operations | 32.3 |  | 23.3 |  | 21.9 |
OneBeacon |  |  |  |  |  |
SUPPLEMENTARY INSURANCE INFORMATION |  |  |  |  |  |
Deferred acquisition costs | 123.9 |  | 123.5 |  | 114.5 |
Future policy benefits, losses, claims and loss expenses | 1,000.0 |  | 3,358.6 |  | 3,295.5 |
Unearned premiums | 573.8 |  | 528.0 |  | 627.5 |
Other policy claims and benefits payable | 0 |  | 0 |  | 0 |
Premiums earned | 1,132.0 |  | 1,012.2 |  | 1,181.1 |
Net investment income | 53.6 | [1] | 71.4 | [1] | 96.6 | [1]
Benefits, claims, losses, and settlement expenses | 650.0 |  | 548.3 |  | 685.6 |
Amortization of deferred policy acquisition costs | 249.4 |  | 221.2 |  | 252.1 |
Other operating expenses | 205.2 |  | 162.3 |  | 196.1 |
Premiums written | 1,179.2 |  | 1,062.7 |  | 1,167.7 |
Sirius Group |  |  |  |  |  |
SUPPLEMENTARY INSURANCE INFORMATION |  |  |  |  |  |
Deferred acquisition costs | 71.4 |  | 63.5 |  | 61.6 |
Future policy benefits, losses, claims and loss expenses | 2,168.9 |  | 2,343.7 |  | 2,441.3 |
Unearned premiums | 350.2 |  | 319.0 |  | 311.2 |
Other policy claims and benefits payable | 0 |  | 0 |  | 0 |
Premiums earned | 931.6 |  | 912.3 |  | 847.9 |
Net investment income | 65.0 | [1] | 89.9 | [1] | 90.5 | [1]
Benefits, claims, losses, and settlement expenses | 543.9 |  | 626.0 |  | 531.0 |
Amortization of deferred policy acquisition costs | 180.8 |  | 181.0 |  | 167.5 |
Other operating expenses | 116.4 |  | 105.8 |  | 99.8 |
Premiums written | 947.7 |  | 915.7 |  | 865.8 |
HG Global-BAM [Member] |  |  |  |  |  |
SUPPLEMENTARY INSURANCE INFORMATION |  |  |  |  |  |
Deferred acquisition costs | 0 |  |  |  |  |
Future policy benefits, losses, claims and loss expenses | 0 |  |  |  |  |
Unearned premiums | 0 |  |  |  |  |
Other policy claims and benefits payable | 0 |  |  |  |  |
Premiums earned | 0 |  |  |  |  |
Net investment income | 2.2 | [1] |  |  |  |
Benefits, claims, losses, and settlement expenses | 0 |  |  |  |  |
Amortization of deferred policy acquisition costs | 0 |  |  |  |  |
Other operating expenses | 0.2 |  |  |  |  |
Premiums written | 0 |  |  |  |  |
Other Operations |  |  |  |  |  |
SUPPLEMENTARY INSURANCE INFORMATION |  |  |  |  |  |
Net investment income | $ 0.5 | [1] | $ (0.1) | [1] | $ (0.1) | [1]
[1] | The amounts shown exclude net investment income relating to non-insurance operations in the other operations segment of $32.3, $23.3 and $21.9 for the twelve months ended December 31, 2012, 2011 and 2010, respectively.

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- Definition Amount of amortization of deferred policy acquisition costs recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of insurance benefits, claims, losses and settlement expenses incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force on the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of reserves for future policy claims payable and loss expenses to be incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of net investment income earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of other operating expense incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of claims and benefits payable not included within other categories. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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- Definition Amount of actual written premiums, including, as applicable, premiums from reinsurance assumed and net of premiums on reinsurance ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574960-122915 + Details
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