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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Goodwill and Intangible Assets | The following table shows the change in goodwill and other intangible assets:
|  | Three Months Ended September 30,
|  | 2017 |  | 2016
Millions |  | Goodwill |  | Other intangible assets |  | Total |  | Goodwill |  | Other intangible assets |  | Total
Beginning balance |  | $ | 25.9 |  |  | $ | 14.4 |  |  | $ | 40.3 |  |  | $ | 18.3 |  |  | $ | 23.3 |  |  | $ | 41.6 |
Acquisition of businesses |  | — |  |  | — |  |  | — |  |  | 7.6 |  |  | 1.1 |  |  | 8.7 |
Amortization, including foreign currency translation |  | — |  |  | (2.5 | ) |  | (2.5 | ) |  | — |  |  | (2.6 | ) |  | (2.6 | )
Ending balance |  | $ | 25.9 |  |  | $ | 11.9 |  |  | $ | 37.8 |  |  | $ | 25.9 |  |  | $ | 21.8 |  |  | $ | 47.7 |
|  | Nine Months Ended September 30,
|  | 2017 |  | 2016
Millions |  | Goodwill |  | Other intangible assets |  | Total |  | Goodwill |  | Other intangible assets |  | Total
Beginning balance |  | $ | 25.9 |  |  | $ | 19.3 |  |  | $ | 45.2 |  |  | $ | 18.6 |  |  | $ | 26.9 |  |  | $ | 45.5 |
Add: Amounts held for sale at beginning of the period (1) |  | — |  |  | — |  |  | — |  |  | — |  |  | .4 |  |  | .4 |
Acquisition of businesses |  |  |  |  |  | — |  |  | 7.6 |  |  | 5.0 |  |  | 12.6 |
Wobi write off |  | — |  |  | — |  |  | — |  |  | (.3 | ) |  | (2.5 | ) |  | (2.8 | )
Amortization, including foreign currency translation |  | — |  |  | (7.4 | ) |  | (7.4 | ) |  | — |  |  | (8.0 | ) |  | (8.0 | )
Ending balance |  | $ | 25.9 |  |  | $ | 11.9 |  |  | $ | 37.8 |  |  | $ | 25.9 |  |  | $ | 21.8 |  |  | $ | 47.7 |
(1) See Note 15 — “Held for Sale and Discontinued Operations”.
Schedule of Intangible Assets and Goodwill | The following table is a summary of goodwill and other intangible assets as of September 30, 2017, December 31, 2016, and September 30, 2016:
Millions |  | September 30, 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 |  | 11.0 |  |  | 18.3 |
Buzzmove |  | .9 |  |  | 1.0 |
Total other intangible assets |  | 11.9 |  |  | 19.3 |
Total goodwill and other intangible assets |  | 37.8 |  |  | 45.2 |
Goodwill and other intangible assets held for sale |  | — |  |  | 1.2 |
Goodwill and other intangible assets attributed to non-controlling interests |  | (13.7 | ) |  | (17.1 | )
Goodwill and other intangible assets included in White Mountains's common shareholders' equity |  | $ | 24.1 |  |  | $ | 29.3 |

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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=35741047&loc=d3e13816-109267 + Details
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