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SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS | 12 Months Ended
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Dec. 31, 2017
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract] |
SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS | WHITE MOUNTAINS INSURANCE GROUP, LTD. SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS (2)
Column A |  | Column B |  | Column C |  | Column D |  | Column E |  | Column F |  | Column G |  | Column H |  | Column I |  | Column J |  | Column K
Millions |  | Deferred acquisition costs |  | Reserves for Unpaid Claims and Claims Adjustment Expenses |  | Discount, if any, deducted in Column C |  | Unearned Premiums |  | Earned Premiums |  | Net investment income |  | Claims and Claims Adjustment Expenses Incurred Related to |  | Amortization of deferred policy acquisition costs |  | Paid Claims and Claims Adjustment Expenses |  | Premiums written
Affiliation with registrant |  |  |  |  |  |  |  | Current Year |  | Prior Year |  |  |
Other operations (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.0 |  |  | $ | — |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.9 |
2016 |  | — |  |  | — |  |  | — |  |  | — |  |  | 7.5 |  |  | .2 |  |  | 8.6 |  |  | (0.6 | ) |  | 2.2 |  |  | 8.8 |  |  | 6.5 |
2015 |  | — |  |  | — |  |  | — |  |  | — |  |  | 8.7 |  |  | .2 |  |  | 10.4 |  |  | (2.2 | ) |  | 3.4 |  |  | 10.4 |  |  | 10.1 |
(1) | 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”.
(2) | Schedule excludes amounts 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 the supplemental schedule of information for an entity who has a consolidated property-casualty insurance underwriter, unconsolidated property-casualty subsidiary or fifty percent-or-less owned property-casualty equity investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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