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Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Segment, Discontinued Operations | Jun. 30, 2013 Segment, Discontinued Operations | Jun. 30, 2014 Segment, Discontinued Operations | Jun. 30, 2013 Segment, Discontinued Operations | Jun. 30, 2014 Segment, Discontinued Operations OneBeacon Runoff Contract | Jun. 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 | Jun. 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 | Jun. 30, 2013 Safeco v. American International Group, Inc. [Member] Segment, Discontinued Operations | Jun. 30, 2014 Safeco v. American International Group, Inc. [Member] Segment, Discontinued Operations
Discontinued Operations [Line Items} |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations |  |  |  |  | $ 2.6 | $ 3.9 | $ 2.1 | $ 4.4 |  |  |  |  |  |  |  |  |
Net income from discontinued operations, net of tax | 2.6 | 3.9 | 2.1 | 4.4 | (0.1) | 3.9 | (0.6) | 4.4 |  |  |  |  |  |  |  |  |
Other Income | 6.4 | 0.4 | 3.0 | 28.7 | 0 | 12.2 | 0 | 12.2 |  |  |  |  |  |  |  | 7.4 | 7.4
Increase decrease cap of seller financing |  |  |  |  |  |  |  |  | 6.7 |  |  |  |  |  |  |  |
Seller financing |  |  |  |  |  |  |  |  | 80.9 | 80.9 |  |  |  |  |  |  |
Surplus Notes |  |  |  |  |  |  |  |  | 80.9 | 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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,157.8 | 1,243.7 |  |
A M Best Rating System, Number of Debt Ratings |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |
Reinsurance recoverable on paid losses |  |  |  |  |  |  |  |  | 7.9 | 7.9 |  |  |  |  |  |  |
Reinsurance recoverables, gross of purchase accounting adjustments |  |  |  |  |  |  |  |  | 1,637.7 | 1,637.7 |  |  |  |  |  |  |
Purchase accounting adjustments |  |  |  |  |  |  |  |  | 130.3 | 130.3 |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | (0.8) |  |  |  |  |  |  |  |
Gain (Loss) on Disposal of Discontinued Operation |  |  |  |  | (0.5) | 0 | (0.5) | 0 | (0.5) |  |  |  |  |  |  |  |
Reserve charge under the SPA, Gross |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |
Reserve charge under the SPA |  |  |  |  |  |  |  |  |  |  | 4.8 |  |  |  |  |  |
Transfer of assets |  |  |  |  |  |  |  |  |  |  | $ 7.4 |  |  |  |  |  |

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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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