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Non-controlling Interest (Tables) | 3 Months Ended
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Mar. 31, 2015
Noncontrolling Interest [Line Items] |
Noncontrolling Interest Disclosure [Text Block] | The following table details the balance of non-controlling interests included in White Mountains’s total equity and the related percentage of each consolidated entity’s total equity owned by non-controlling shareholders as of March 31, 2015 and December 31, 2014:
|  | March 31, 2015 |  | December 31, 2014
$ in millions |  | Non-controlling Percentage |  | Non-controlling Equity |  | Non-controlling Percentage |  | Non-controlling Equity
OneBeacon Ltd. |  | 24.7 | % |  | $ | 258.8 |  |  | 24.7 | % |  | $ | 258.4 |
SIG Preference Shares |  | 100.0 |  |  | 250.0 |  |  | 100.0 |  |  | 250.0 |
Other, excluding mutuals and reciprocals |  |  |  |  |  |  |  |
HG Global |  | 3.1 |  |  | 17.7 |  |  | 3.1 |  |  | 17.9 |
MediaAlpha |  | 40.0 |  |  | 22.0 |  |  | 40.0 |  |  | 22.6 |
Tranzact |  | 36.8 |  |  | 81.8 |  |  | 36.8 |  |  | 88.2 |
Wobi |  | 36.7 |  |  | 4.7 |  |  | 36.7 |  |  | 5.4 |
Prospector Offshore Fund |  | 32.4 |  |  | 31.0 |  |  | 23.4 |  |  | 31.1 |
Dewar |  | 20.3 |  |  | 3.0 |  |  | 18.0 |  |  | 3.4 |
Total other, excluding mutuals and reciprocals |  |  |  | 160.2 |  |  |  |  | 168.6 |
Mutuals and reciprocals |  |  |  |  |  |  |  |
BAM |  | 100.0 |  |  | (127.0 | ) |  | 100.0 |  |  | (121.9 | )
SSIE |  | 100.0 |  |  | (13.5 | ) |  | 100.0 |  |  | (12.4 | )
Total non-controlling interests |  |  |  | $ | 528.5 |  |  |  |  | $ | 542.7 |

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- Definition The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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