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SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES | 12 Months Ended
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Dec. 31, 2015
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, 2015
Millions |  | Cost |  | Carrying Value |  | Fair Value
Fixed maturity investments: |  |  |  |  |  |  |  |  |
Bonds: |  |  |  |  |  |
U.S. Government and government agencies and authorities |  | $ | 160.4 |  |  | $ | 160.0 |  |  | $ | 160.0 |
Debt securities issued by corporations |  | 1,001.0 |  |  | 1,000.0 |  |  | 1,000.0 |
States, municipalities and political subdivisions |  | 227.8 |  |  | 228.8 |  |  | 228.8 |
Mortgage-backed and asset-backed securities |  | 1,170.6 |  |  | 1,167.0 |  |  | 1,167.0 |
Foreign governments |  | 1.0 |  |  | 1.2 |  |  | 1.2 |
Redeemable preferred stocks |  | 78.3 |  |  | 82.7 |  |  | 82.7 |
Total fixed maturity investments |  | 2,639.1 |  |  | 2,639.7 |  |  | 2,639.7 |
Short-term investments |  | 211.3 |  |  | 211.3 |  |  | 211.3 |
Common equity securities: |  |  |  |  |  |
Exchange traded funds |  | 147.2 |  |  | 141.8 |  |  | 141.8 |
Banks, trust and insurance companies |  | 436.9 |  |  | 694.7 |  |  | 694.7 |
Public utilities |  | — |  |  | — |  |  | — |
Industrial, miscellaneous and other |  | 238.4 |  |  | 277.4 |  |  | 277.4 |
Total common equity securities |  | 822.5 |  |  | 1,113.9 |  |  | 1,113.9 |
Other long-term investments(1) |  | 285.9 |  |  | 297.3 |  |  | 297.3 |
Total investments |  | $ | 3,958.8 |  |  | $ | 4,262.2 |  |  | $ | 4,262.2 |
(1) Excludes carrying value of $3.8 associated with other long-term investment limited partnerships accounted for using the equity method. Excludes carrying value of $14.7 associated with a tax advantaged federal affordable housing development fund accounted for using the proportional amortization method. 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 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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