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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | 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:
$ in millions |  | Weighted Average Economic life (in years) |  | December 31, 2016 |  | December 31, 2015
| 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 |
Wobi |  | N/A |  | 5.8 |  |  | — |  |  | 5.8 |  |  | 5.8 |  |  | — |  |  | 5.8 |
Buzzmove |  | N/A |  | 7.6 |  |  | — |  |  | 7.6 |  |  | — |  |  | — |  |  | — |
Total goodwill |  |  |  | 31.7 |  |  | — |  |  | 31.7 |  |  | 24.1 |  |  | — |  |  | 24.1 |
Other intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
MediaAlpha |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 3 |  | 10.0 |  |  | 6.2 |  |  | 3.8 |  |  | 6.5 |  |  | 2.9 |  |  | 3.6 |
Information technology |  | 5 |  | 32.4 |  |  | 17.9 |  |  | 14.5 |  |  | 32.0 |  |  | 11.2 |  |  | 20.8 |
Subtotal |  |  |  | 42.4 |  |  | 24.1 |  |  | 18.3 |  |  | 38.5 |  |  | 14.1 |  |  | 24.4 |
Wobi |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 8 |  | 2.1 |  |  | .8 |  |  | 1.3 |  |  | 2.1 |  |  | .5 |  |  | 1.6 |
Information technology |  | 7 |  | 3.6 |  |  | 1.2 |  |  | 2.4 |  |  | 3.6 |  |  | .7 |  |  | 2.9 |
Subtotal |  |  |  | 5.7 |  |  | 2.0 |  |  | 3.7 |  |  | 5.7 |  |  | 1.2 |  |  | 4.5 |
Buzzmove |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark |  | 7 |  | .6 |  |  | .1 |  |  | .5 |  |  | — |  |  | — |  |  | — |
Information technology |  | 5 |  | .5 |  |  | — |  |  | .5 |  |  | — |  |  | — |  |  | — |
Subtotal |  |  |  | 1.1 |  |  | .1 |  |  | 1.0 |  |  | — |  |  | — |  |  | — |
OneBeacon |  | 10 |  | 9.4 |  |  | 8.2 |  |  | 1.2 |  |  | 9.4 |  |  | 7.0 |  |  | 2.4 |
Total other intangible assets |  | 58.6 |  |  | 34.4 |  |  | 24.2 |  |  | 53.6 |  |  | 22.3 |  |  | 31.3 |
Total goodwill and other intangible assets (1) |  | $ | 90.3 |  |  | $ | 34.4 |  |  | $ | 55.9 |  |  | $ | 77.7 |  |  | $ | 22.3 |  |  | $ | 55.4 |
Schedule of Goodwill and Intangible Assets Rollforward | The following table shows the change in goodwill and other intangible assets:
|  | December 31,
|  | 2016 |  | 2015
Millions |  | Goodwill |  | Other intangible assets |  | Goodwill |  | Other intangible assets
Beginning balance |  | $ | 24.1 |  |  | $ | 31.3 |  |  | $ | 23.8 |  |  | $ | 38.7 |
Add: Star & Shield amounts held for sale at beginning of the period (1) |  | — |  |  | .4 |  |  | — |  |  | .8 |
Acquisitions of businesses |  | 7.6 |  |  | 1.1 |  |  | .3 |  |  | 2.8 |
Acquisitions of other intangible assets |  | — |  |  | 3.9 |  |  | — |  |  | — |
Amortization, including foreign currency translation |  | — |  |  | (12.5 | ) |  | — |  |  | (10.6 | )
Less: Star & Shield amounts held for sale at end of the period (1) |  | — |  |  | — |  |  | — |  |  | .4 |
Ending balance |  | $ | 31.7 |  |  | $ | 24.2 |  |  | $ | 24.1 |  |  | $ | 31.3 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | White Mountains expects to recognize amortization expense in each of the next five years as follows:
Millions |  | Amortization expense
2017 |  | $ | 10.9 |
2018 |  | 8.3 |
2019 |  | 2.3 |
2020 |  | .7 |
2021 |  | .9 |
Total |  | $ | 23.1 |

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