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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | 12 Months Ended
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Dec. 31, 2017
Supplementary Insurance Information [Abstract] |
SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION | WHITE MOUNTAINS INSURANCE GROUP, LTD. SUPPLEMENTARY INSURANCE INFORMATION (3)
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 acquisition costs |  | Future policy benefits, losses, claims and loss expenses |  | Unearned premiums |  | Other policy claims and benefits payable |  | Premiums earned |  | Net investment income (1) |  | Benefits, claims, losses, and settlement expenses |  | Amortization of deferred policy acquisition costs |  | Other operating expenses |  | Premiums written
Years ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HG Global/BAM |  | $ | 14.8 |  |  | $ | — |  |  | $ | 136.8 |  |  | $ | — |  |  | $ | 9.4 |  |  | $ | 12.3 |  |  | $ | — |  |  | $ | 4.0 |  |  | $ | .4 |  |  | $ | 63.2 |
Other operations (2) |  | — |  |  | — |  |  | — |  |  | — |  |  | 1.0 |  |  | — |  |  | 1.1 |  |  | .1 |  |  | — |  |  | 0.9 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HG Global/BAM |  | 10.6 |  |  | — |  |  | 82.9 |  |  | — |  |  | 5.9 |  |  | 9.0 |  |  | — |  |  | 3.4 |  |  | .4 |  |  | 38.6 |
Other operations (2) |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.5 |  |  | .2 |  |  | 8.0 |  |  | 2.2 |  |  | .1 |  |  | 6.5 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HG Global/BAM |  | 6.9 |  |  | — |  |  | 50.2 |  |  | — |  |  | 3.3 |  |  | 6.1 |  |  | — |  |  | 2.9 |  |  | .4 |  |  | 25.9 |
Other operations (2) |  | — |  |  | — |  |  | — |  |  | — |  |  | 8.7 |  |  | .2 |  |  | 8.2 |  |  | 3.4 |  |  | — |  |  | 10.1 |
(1) The amounts shown exclude net investment income relating to non-insurance operations of $43.7, $22.9 and $4.6 for the twelve months ended December 31, 2017, 2016 and 2015, respectively. (2) The Other operations amounts shown relate to SSIE. White Mountains completed the sale of SSIE on March 7, 2017. See Note 19 — “Held for Sale and Discontinued Operations”. (3) Schedule excludes activity related to OneBeacon and Sirius Group for all periods presented. See Note 19 — “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 required supplementary insurance information giving segment detail in support of various balance sheet and income statement captions. The balance sheet information generally is presented as of the date of each audited balance sheet filed, and the income statement information generally is presented for each period for which an audited income statement is required to be filed. Supplementary insurance information table includes segment name; deferred policy acquisition costs; future policy benefits, losses, claims and loss expenses; unearned premiums; other policy claims and benefits payable; premium revenue; net investment income; benefits, claims, losses and settlement expenses; amortization of deferred policy acquisition costs; other operating expenses; and premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 + Details
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