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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] | The following table presents the economic lives, acquisition date values, accumulated amortization and net carrying values for other intangible assets and goodwill, by company:
$ in millions |  | Weighted Average Economic life (in years) |  | December 31, 2017 |  | December 31, 2016
| Acquisition date fair value |  | Accumulated amortization |  | Net carrying value |  | Acquisition date fair value |  | Accumulated amortization |  | Net carrying value
Goodwill: |  |  |  |  |  |  |  |  |  |  |  |  |  |
MediaAlpha |  | N/A |  | $ | 18.3 |  |  | $ | — |  |  | $ | 18.3 |  |  | $ | 18.3 |  |  | $ | — |  |  | $ | 18.3 |
Buzzmove |  | N/A |  | 7.6 |  |  | — |  |  | 7.6 |  |  | 7.6 |  |  | — |  |  | 7.6 |
Total goodwill |  |  |  | 25.9 |  |  | — |  |  | 25.9 |  |  | 25.9 |  |  | — |  |  | 25.9 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
MediaAlpha |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 8 |  | 36.6 |  |  | 10.2 |  |  | 26.4 |  |  | 10.0 |  |  | 6.2 |  |  | 3.8 |
Information technology |  | 5 |  | 33.3 |  |  | 24.3 |  |  | 9.0 |  |  | 32.4 |  |  | 17.9 |  |  | 14.5 |
Subtotal |  |  |  | 69.9 |  |  | 34.5 |  |  | 35.4 |  |  | 42.4 |  |  | 24.1 |  |  | 18.3 |
Buzzmove |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 7 |  | .6 |  |  | .1 |  |  | .5 |  |  | .6 |  |  | .1 |  |  | .5 |
Information technology |  | 5 |  | .5 |  |  | .2 |  |  | .3 |  |  | .5 |  |  | — |  |  | .5 |
Subtotal |  |  |  | 1.1 |  |  | .3 |  |  | .8 |  |  | 1.1 |  |  | .1 |  |  | 1.0 |
Total other intangible assets |  | 71.0 |  |  | 34.8 |  |  | 36.2 |  |  | 43.5 |  |  | 24.2 |  |  | 19.3 |
Total goodwill and other intangible assets |  | $ | 96.9 |  |  | $ | 34.8 |  |  | $ | 62.1 |  |  | $ | 69.4 |  |  | $ | 24.2 |  |  | $ | 45.2 |
Schedule of Intangible Assets and Goodwill | The following table presents goodwill and other intangible assets as of December 31, 2017 and December 31, 2016:
Millions |  | December 31, 2017 |  | December 31, 2016 |
Goodwill: |  |  |  |  |
MediaAlpha |  | $ | 18.3 |  |  | $ | 18.3 |  |
Buzzmove |  | 7.6 |  |  | 7.6 |  |
Total goodwill |  | 25.9 |  |  | 25.9 |  |
Other intangible assets: |  |  |  |  |
MediaAlpha |  | 35.4 |  |  | 18.3 |  |
Buzzmove |  | .8 |  |  | 1.0 |  |
Total other intangible assets |  | 36.2 |  |  | 19.3 |  |
Total goodwill and other intangible assets |  | 62.1 |  |  | 45.2 |  |
Goodwill and other intangible assets held for sale |  | — |  |  | 1.2 |  |
Goodwill and other intangible assets attributed to non-controlling interests |  | (21.1 | ) |  | (17.1 | ) |
Goodwill and other intangible assets included in White Mountains’s common shareholders' equity |  | $ | 41.0 |  |  | $ | 29.3 |  |
Schedule of Goodwill and Intangible Assets Rollforward | The following table presents the change in goodwill and other intangible assets:
|  | December 31,
|  | 2017 |  | 2016
Millions |  | Goodwill |  | Other intangible assets |  | Goodwill |  | Other intangible assets
Beginning balance |  | $ | 25.9 |  |  | $ | 19.3 |  |  | $ | 18.6 |  |  | $ | 26.9 |
Add: Star & Shield amounts held for sale at beginning of the period (1) |  | — |  |  | — |  |  | — |  |  | .4 |
Acquisitions of businesses and asset groups (2) |  |  |  | 27.6 |  |  | 7.6 |  |  | 5.0 |
Wobi write-off |  | — |  |  | — |  |  | (.3 | ) |  | (2.5 | )
Amortization, including foreign currency translation |  | — |  |  | (10.7 | ) |  | — |  |  | (10.5 | )
Ending balance |  | $ | 25.9 |  |  | $ | 36.2 |  |  | $ | 25.9 |  |  | $ | 19.3 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | White Mountains expects to recognize amortization expense in each of the next five years as the following table presents:
Millions |  | Amortization expense
2018 |  | $ | 10.2 |
2019 |  | 5.0 |
2020 |  | 3.2 |
2021 |  | 2.9 |
2022 |  | 2.8 |
Total |  | $ | 24.1 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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