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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Segment, Discontinued Operations | Sep. 30, 2013 Segment, Discontinued Operations | Sep. 30, 2014 Segment, Discontinued Operations | Sep. 30, 2013 Segment, Discontinued Operations | Sep. 30, 2014 Segment, Discontinued Operations OneBeacon Runoff Contract | Jun. 30, 2014 Segment, Discontinued Operations OneBeacon Runoff | Sep. 30, 2014 Segment, Discontinued Operations OneBeacon Runoff Rating Contract | Jun. 30, 2014 OneBeacon Runoff Segment, Discontinued Operations | May 31, 2001 N I C O Cover [Member] Segment, Discontinued Operations OneBeacon Runoff | May 31, 2001 G R C Cover [Member] Segment, Discontinued Operations OneBeacon Runoff | Sep. 30, 2014 GRC and NICO Cover [Member] Segment, Discontinued Operations OneBeacon Runoff | Dec. 31, 2013 GRC and NICO Cover [Member] Segment, Discontinued Operations OneBeacon Runoff | Sep. 30, 2014 Safeco v. American International Group, Inc. [Member] Segment, Discontinued Operations
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations |  |  |  |  | $ 6.7 | $ 0.4 | $ 8.8 | $ 4.8 |  |  |  |  |  |  |  |  |
Net income from discontinued operations, net of tax | 6.7 | 0.4 | 8.8 | 4.8 | (0.3) | 0.4 | (0.9) | 4.8 |  |  |  |  |  |  |  |  |
Other Income | 5.3 | 18.2 | 8.3 | 46.9 | 0 | 0.1 | 0 | 12.3 |  |  |  |  |  |  |  |  | 7.4
Increase decrease cap of seller financing |  |  |  |  |  |  |  |  |  | 6.7 |  |  |  |  |  |  |
Seller financing |  |  |  |  |  |  |  |  |  | 80.9 |  |  |  |  |  |  |
Surplus Notes |  |  |  |  |  |  |  |  |  | 80.9 |  |  |  |  |  |  |
Discontinued Operation, Estimated Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  | 8.2 |  |  |  |  |  |  |
Discontinued Operation, Estimated Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  |  |  |  | 5.3 |  |  |  |  |  |  |
Reserve charge under the SPA, before tax |  |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |
Reserve charge under the SPA, after-tax |  |  |  |  |  |  |  |  |  |  |  | 4.8 |  |  |  |  |
Number of contracts seller caused one beacon to purchase prior to acquisition |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |
Reinsurance recoverable cover under reinsurance contract |  |  |  |  |  |  |  |  |  |  |  |  | 2,500.0 | 570.0 |  |  |
Adverse loss reserve development on losses occurring in years 2000 and prior |  |  |  |  |  |  |  |  |  |  |  |  |  | 400.0 |  |  |
Loss reserves ceded at acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 170.0 |  |  |
Reinsurance recoverables |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,127.4 | 1,243.7 |
A M Best Rating System, Number of Debt Ratings |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |
Reinsurance recoverable on paid losses |  |  |  |  |  |  |  |  | 7.4 |  | 7.4 |  |  |  |  |  |
Reinsurance recoverables, gross of purchase accounting adjustments |  |  |  |  |  |  |  |  | 1,585.4 |  | 1,585.4 |  |  |  |  |  |
Purchase accounting adjustments |  |  |  |  |  |  |  |  | 127.0 |  | 127.0 |  |  |  |  |  |
Gain (Loss) on Disposal of Discontinued Operation | 14.0 |  |  |  | 7.0 | 0 | 9.7 | 0 | 6.7 |  |  |  |  |  |  |  |
Transfer of additional assets |  |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | $ 10.3 |  |  |  |  |  |  |  |

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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 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 210.7-04.12) -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 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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- Definition Represents the number of reinsurance contracts the seller caused subsidiary entity to purchase from subsidiaries of Berkshire Hathaway Inc. immediately prior to the entity's acquisition of subsidiary entity. + References No definition available. + Details
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