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SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES | 12 Months Ended
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Dec. 31, 2017
Summary of Investments, Other than Investments in Related Parties [Abstract] |
SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES | WHITE MOUNTAINS INSURANCE GROUP, LTD. SUMMARY OF INVESTMENTS—OTHER THAN INVESTMENTS IN RELATED PARTIES At December 31, 2017
Millions |  | Cost |  | Carrying Value |  | Fair Value
Fixed maturity investments: |  |  |  |  |  |  |  |  |
U.S. Government and government agencies and authorities |  | $ | 297.8 |  |  | $ | 296.5 |  |  | $ | 296.5 |
Debt securities issued by corporations |  | 867.6 |  |  | 880.9 |  |  | 880.9 |
Mortgage and asset-backed securities |  | 697.2 |  |  | 694.7 |  |  | 694.7 |
States, municipalities and political subdivisions |  | 252.0 |  |  | 254.9 |  |  | 254.9 |
Foreign governments |  | 2.6 |  |  | 2.7 |  |  | 2.7 |
Total fixed maturity investments |  | 2,117.2 |  |  | 2,129.7 |  |  | 2,129.7 |
Short-term investments |  | 176.1 |  |  | 176.1 |  |  | 176.1 |
Common equity securities: |  |  |  |  |  |
Exchange traded funds |  | 512.5 |  |  | 569.7 |  |  | 569.7 |
Banks, trust and insurance companies |  | 12.8 |  |  | 16.3 |  |  | 16.3 |
Industrial, miscellaneous and other |  | 214.4 |  |  | 280.1 |  |  | 280.1 |
Total common equity securities |  | 739.7 |  |  | 866.1 |  |  | 866.1 |
Other long-term investments (1) |  | 246.6 |  |  | 208.8 |  |  | 208.8 |
Total investments |  | $ | 3,279.6 |  |  | $ | 3,380.7 |  |  | $ | 3,380.7 |
(1) | Includes carrying value of $(3.7) related to foreign currency forward contracts.
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 schedule applicable to insurance companies summarizing investments held as of the most recent audited balance sheet. At a minimum, such summary is by three major categories of investments including: (1) fixed maturities primarily consisting of bonds, including convertibles and bonds with warrants, and redeemable preferred stocks, (2) equity securities primarily consisting of common stocks and nonredeemable preferred stocks, and (3) other investments including mortgage loans on real estate, real estate held for investment, real estate acquired in satisfaction of debt, policy loans, other long-term investments, and short-term investments not otherwise categorized. The information provided with respect to each item within each category includes: (A) the original cost of equity securities and, as to fixed maturity securities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts, (B) fair value as of the reporting date, and (C) the amount at which the item within each category is shown in the statement of financial position; with respect to (C), if the amount at which shown in the statement of financial position is different from the items original [amortized] cost or fair value, an explanation of the difference may be included herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -URI http://asc.fasb.org/subtopic&trid=4738175 + Details
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