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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |
SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | WHITE MOUNTAINS INSURANCE GROUP, LTD. SUPPLEMENTARY INSURANCE INFORMATION (1)
| Column A |  | Column B |  | Column C |  | Column D |  | Column E |  | Column F |  | Column G |  | Column H |  | Column I |  | Column J |  | Column K
| Millions Segment |  | Deferred Acqui- sition Costs |  | Future Policy Benefits, Losses, Claims and Loss Expenses |  | Unearned Premiums |  | Other Policy Claims and Benefits Payable |  | Premiums Earned |  | Net Investment Income |  | Benefits, Claims, Losses and Settlement Expenses |  | Amortization of Deferred Policy Acquisition Costs |  | Other Operating Expenses |  | Premiums Written
Years ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| HG Global/ BAM | $ | 22.1 |  |  | $ | — |  |  | $ | 198.4 |  |  | $ | — |  |  | $ | 16.3 |  |  | $ | 21.6 |  |  | $ | — |  |  | $ | 5.7 |  |  | $ | .4 |  |  | $ | 38.7 |
| Other Operations (2) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| HG Global/ BAM | 19.0 |  |  | — |  |  | 176.0 |  |  | — |  |  | 13.9 |  |  | 16.7 |  |  | — |  |  | 5.3 |  |  | .4 |  |  | 52.9 |
| Other Operations (2) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| HG Global/ BAM | 14.8 |  |  | — |  |  | 136.8 |  |  | — |  |  | 9.4 |  |  | 12.3 |  |  | — |  |  | 4.0 |  |  | .4 |  |  | 63.2 |
| Other Operations (2)(3) | — |  |  | — |  |  | — |  |  | — |  |  | 1.0 |  |  | — |  |  | 1.1 |  |  | .1 |  |  | — |  |  | .9 |
(1) Schedule excludes activity related to OneBeacon and Sirius Group for the year ended December 31, 2017. See Note 20 — “Held for Sale and Discontinued Operations”. (2) The amounts shown exclude net investment income relating to non-insurance operations of $43.4, $42.3 and $43.7 for the twelve months ended December 31, 2019, 2018 and 2017, respectively. (3) The Other Operations amounts shown relate to SSIE. White Mountains completed the sale of SSIE on March 7, 2017. See Note 20 — “Held for Sale and Discontinued Operations”. Schedules of the Registrant should be read in conjunction with the Consolidated Financial Statements and Notes.

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- Definition The entire disclosure for supplementary insurance information by segment. Includes, but is not limited to, deferred policy acquisition cost; future policy benefit, loss, claim and loss expenses; unearned premium; other policy claim and benefit payable; premium revenue; net investment income; benefit, claim, loss and settlement expenses; amortization of deferred policy acquisition cost; other operating expense; and premium written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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