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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Segment reporting information |  |
Earned insurance and reinsurance premiums | $ 499.0 | $ 467.8
Net investment income | 41.8 | 49.5
Net realized and unrealized investment gains | 58.6 | (9.2)
Other revenue | 31.2 | 21.5
Total revenues | 630.6 | 529.6
Loss and loss adjustment expenses | 262.7 | 358.4
Insurance and reinsurance acquisition expenses | 108.4 | 90.7
Other underwriting expenses | 74.8 | 73.1
General and administrative expenses | 45.5 | 28.0
Interest expense on debt | 10.9 | 13.1
Total expenses | 502.3 | 563.3
Pre-tax income (loss) from continuing operations | 128.3 | (33.7)
OneBeacon |  |
Segment reporting information |  |
Earned insurance and reinsurance premiums | 272.8 | 245.1
Net investment income | 14.7 | 21.0
Net realized and unrealized investment gains | 29.8 | 23.1
Other revenue | 0.1 | 0.8
Total revenues | 317.4 | 290.0
Loss and loss adjustment expenses | 149.3 | 130.4
Insurance and reinsurance acquisition expenses | 57.4 | 49.0
Other underwriting expenses | 48.8 | 49.3
General and administrative expenses | 2.7 | 2.3
Interest expense on debt | 4.1 | 6.3
Total expenses | 262.3 | 237.3
Pre-tax income (loss) from continuing operations | 55.1 | 52.7
Sirius |  |
Segment reporting information |  |
Earned insurance and reinsurance premiums | 226.2 | 222.7
Net investment income | 17.1 | 23.5
Net realized and unrealized investment gains | 13.7 | (36.1)
Other revenue | 18.3 | 24.9
Total revenues | 275.3 | 235.0
Loss and loss adjustment expenses | 113.4 | 228.0
Insurance and reinsurance acquisition expenses | 51.0 | 41.7
Other underwriting expenses | 26.0 | 23.8
General and administrative expenses | 18.9 | 6.7
Interest expense on debt | 6.5 | 6.5
Total expenses | 215.8 | 306.7
Pre-tax income (loss) from continuing operations | 59.5 | (71.7)
Other Operations |  |
Segment reporting information |  |
Net investment income | 10.0 | 5.0
Net realized and unrealized investment gains | 15.1 | 3.8
Other revenue | 12.8 | (4.2)
Total revenues | 37.9 | 4.6
General and administrative expenses | 23.9 | 19.0
Interest expense on debt | 0.3 | 0.3
Total expenses | 24.2 | 19.3
Pre-tax income (loss) from continuing operations | $ 13.7 | $ (14.7)

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- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5, 6, 7 -Article 7 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 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 -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 SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 + 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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