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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Segment reporting information |  |  |  |
Earned insurance and reinsurance premiums | $ 536.8 | $ 491.1 | $ 1,545.3 | $ 1,433.5
Net investment income | 37.6 | 42.8 | 119.8 | 138.1
Net realized and unrealized investment gains (losses) | 72.7 | 2.9 | 123.2 | 36.4
Other revenue | 50.3 | (35.0) | 81.0 | (28.3)
Revenues | 697.4 | 501.8 | 1,869.3 | 1,579.7
Loss and loss adjustment expenses | 308.1 | 280.2 | 821.7 | 920.4
Insurance and reinsurance acquisition expenses | 107.6 | 107.0 | 326.2 | 296.6
Other underwriting expenses | 76.6 | 64.3 | 228.4 | 203.9
General and administrative expenses | 58.7 | 36.2 | 146.3 | 120.4
Interest expense on debt | 11.3 | 12.8 | 33.1 | 38.8
Total expenses | 562.3 | 500.5 | 1,555.7 | 1,580.1
Pre-tax income (loss) | 135.1 | 1.3 | 313.6 | (0.4)
OneBeacon |  |  |  |
Segment reporting information |  |  |  |
Earned insurance and reinsurance premiums | 293.9 | 259.1 | 846.0 | 748.0
Net investment income | 12.8 | 16.1 | 41.5 | 55.8
Net realized and unrealized investment gains (losses) | 40.0 | (47.4) | 57.9 | (13.3)
Other revenue | (0.4) | 0.1 | (0.1) | (12.2)
Revenues | 346.3 | 227.9 | 945.3 | 778.3
Loss and loss adjustment expenses | 164.7 | 149.7 | 452.5 | 421.3
Insurance and reinsurance acquisition expenses | 66.6 | 58.6 | 185.6 | 161.5
Other underwriting expenses | 47.4 | 36.0 | 146.2 | 124.5
General and administrative expenses | 4.4 | 2.5 | 9.6 | 7.4
Interest expense on debt | 4.1 | 4.1 | 12.2 | 16.4
Total expenses | 287.2 | 250.9 | 806.1 | 731.1
Pre-tax income (loss) | 59.1 | (23.0) | 139.2 | 47.2
Sirius |  |  |  |
Segment reporting information |  |  |  |
Earned insurance and reinsurance premiums | 242.9 | 232.0 | 699.3 | 685.5
Net investment income | 16.7 | 22.1 | 50.9 | 68.3
Net realized and unrealized investment gains (losses) | (8.9) | 65.9 | 22.9 | 60.7
Other revenue | 48.2 | (29.3) | 48.9 | (13.8)
Revenues | 298.9 | 290.7 | 822.0 | 800.7
Loss and loss adjustment expenses | 143.4 | 130.5 | 369.2 | 499.1
Insurance and reinsurance acquisition expenses | 41.0 | 48.4 | 140.6 | 135.1
Other underwriting expenses | 29.1 | 28.3 | 82.1 | 79.4
General and administrative expenses | 10.2 | 7.4 | 35.4 | 23.3
Interest expense on debt | 6.5 | 6.5 | 19.6 | 19.6
Total expenses | 230.2 | 221.1 | 646.9 | 756.5
Pre-tax income (loss) | 68.7 | 69.6 | 175.1 | 44.2
Other Operations |  |  |  |
Segment reporting information |  |  |  |
Earned insurance and reinsurance premiums | 0 | 0 | 0 | 0
Net investment income | 8.1 | 4.6 | 27.4 | 14.0
Net realized and unrealized investment gains (losses) | 41.6 | (15.6) | 42.4 | (11.0)
Other revenue | 2.5 | (5.8) | 32.2 | (2.3)
Revenues | 52.2 | (16.8) | 102.0 | 0.7
Loss and loss adjustment expenses | 0 | 0 | 0 | 0
Insurance and reinsurance acquisition expenses | 0 | 0 | 0 | 0
Other underwriting expenses | 0.1 | 0 | 0.1 | 0
General and administrative expenses | 44.1 | 26.3 | 101.3 | 89.7
Interest expense on debt | 0.7 | 2.2 | 1.3 | 2.8
Total expenses | 44.9 | 28.5 | 102.7 | 92.5
Pre-tax income (loss) | $ 7.3 | $ (45.3) | $ (0.7) | $ (91.8)

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- Definition Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 27 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 720 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6968134&loc=d3e28434-158551 + Details
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- Definition Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers. + References Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 27 -Subparagraph a, b -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 Amount of policy acquisition costs charged to expense in the period. Includes deferred policy acquisition costs amortized in the period, generally in proportion to related revenue earned over the policy or contract term. + References No definition available. + Details
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