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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following table shows the economic lives, acquisition date values, accumulated amortization and net carrying values for other intangible assets and goodwill, for each company acquired:
Millions |  | Weighted Average Economic life (in years) |  | December 31, 2014 |  | December 31, 2013
| Acquisition date fair value |  | Accumulated amortization |  | Net carrying value |  | Acquisition date fair value |  | Accumulated amortization |  | Net carrying value
Tranzact: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domain and trade names |  | 6 |  | $ | 25.6 |  |  | $ | .9 |  |  | $ | 24.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Customer relationships |  | 10 |  | 107.5 |  |  | 2.1 |  |  | 105.4 |  |  | — |  |  | — |  |  | — |
Information technology |  | 5 |  | 12.7 |  |  | .5 |  |  | 12.2 |  |  | — |  |  | — |  |  | — |
Other |  | 7 |  | .5 |  |  | — |  |  | .5 |  |  | — |  |  | — |  |  | — |
Subtotal |  |  |  | 146.3 |  |  | 3.5 |  |  | 142.8 |  |  | — |  |  | — |  |  | — |
QuoteLab: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 4 |  | 6.5 |  |  | 1.2 |  |  | 5.3 |  |  | — |  |  | — |  |  | — |
Information technology |  | 5 |  | 32.0 |  |  | 4.8 |  |  | 27.2 |  |  | — |  |  | — |  |  | — |
Subtotal |  |  |  | 38.5 |  |  | 6.0 |  |  | 32.5 |  |  | — |  |  | — |  |  | — |
Wobi: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 8 |  | 2.1 |  |  | .2 |  |  | 1.9 |  |  | — |  |  | — |  |  | — |
Information technology |  | 3 |  | .8 |  |  | .2 |  |  | .6 |  |  | — |  |  | — |  |  | — |
Subtotal |  |  |  | 2.9 |  |  | .4 |  |  | 2.5 |  |  | — |  |  | — |  |  | — |
Star & Shield: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationship |  | 3 |  | 1.2 |  |  | .4 |  |  | .8 |  |  | — |  |  | — |  |  | — |
OneBeacon (EBI) |  | 10 |  | 9.4 |  |  | 5.7 |  |  | 3.7 |  |  | 9.4 |  |  | 4.3 |  |  | 5.1 |
Sirius (WM Solutions) - Licenses |  | Indefinite |  | 15.2 |  |  | — |  |  | 15.2 |  |  | 15.6 |  |  | — |  |  | 15.6 |
Total other intangible assets |  | 213.5 |  |  | 16.0 |  |  | 197.5 |  |  | 25.0 |  |  | 4.3 |  |  | 20.7 |
Goodwill: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranzact |  | N/A |  | 145.1 |  |  | — |  |  | 145.1 |  |  | — |  |  | — |  |  | — |
Quote Lab |  | N/A |  | 18.3 |  |  | — |  |  | 18.3 |  |  | — |  |  | — |  |  | — |
Wobi |  | N/A |  | 5.5 |  |  | — |  |  | 5.5 |  |  | — |  |  | — |  |  | — |
Total goodwill |  | 168.9 |  |  | — |  |  | 168.9 |  |  | — |  |  | — |  |  | — |
Total goodwill and other intangible assets |  | $ | 382.4 |  |  | $ | 16.0 |  |  | $ | 366.4 |  |  | $ | 25.0 |  |  | $ | 4.3 |  |  | $ | 20.7 |
Schedule of Goodwill and Intangible Assets Rollforward | The following table shows the change in goodwill and other intangible assets:
|  | December 31,
Millions |  | 2014 |  | 2013
|  | Goodwill |  | Other intangible assets |  | Goodwill |  | Other intangible assets
Beginning balance |  | $ | — |  |  | $ | 20.7 |  |  | $ | — |  |  | $ | 16.9 |
Acquisitions of businesses |  | 168.9 |  |  | 188.9 |  |  | — |  |  | 5.2 |
Dispositions of businesses |  | — |  |  | (.4 | ) |  | — |  |  | — |
Amortization, including foreign currency translation |  | — |  |  | (11.7 | ) |  | — |  |  | (1.4 | )
Ending balance |  | $ | 168.9 |  |  | $ | 197.5 |  |  | $ | — |  |  | $ | 20.7 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | White Mountains expects to recognize amortization expense in each of the next five years as follows:
Millions |  | Amortization expense
2015 |  | $ | 27.1 |
2016 |  | 27.0 |
2017 |  | 26.4 |
2018 |  | 24.6 |
2019 |  | 16.5 |
Total |  | $ | 121.6 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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