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SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES | 12 Months Ended
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Dec. 31, 2012
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, 2012
Millions |  | Cost |  | Carrying Value (1) |  | Fair Value
Fixed maturities: |  |  |  |  |  |  |  |  |
Bonds: |  |  |  |  |  |
U.S. Government and government agencies and authorities |  | $ | 440.4 |  |  | $ | 440.1 |  |  | $ | 440.1 |
Debt securities issued by industrial corporations |  | 2,321.4 |  |  | 2,385.1 |  |  | 2,385.1 |
Mortgage-backed and asset-backed securities |  | 2,081.0 |  |  | 2,095.6 |  |  | 2,095.6 |
States, municipalities and political subdivisions |  | 5.3 |  |  | 5.2 |  |  | 5.2 |
Foreign governments |  | 526.6 |  |  | 521.9 |  |  | 521.9 |
Redeemable preferred stocks |  | 79.9 |  |  | 86.4 |  |  | 86.4 |
Total fixed maturities (1) |  | 5,454.6 |  |  | 5,534.3 |  |  | 5,534.3 |
Short-term investments |  | 630.6 |  |  | 630.6 |  |  | 630.6 |
Common equity securities: |  |  |  |  |  |  |  |  |
Banks, trust and insurance companies |  | 268.6 |  |  | 324.5 |  |  | 324.5 |
Public utilities |  | 39.1 |  |  | 43.6 |  |  | 43.6 |
Industrial, miscellaneous and other |  | 587.5 |  |  | 661.6 |  |  | 661.6 |
Total common equity securities |  | 895.2 |  |  | 1,029.7 |  |  | 1,029.7 |
Convertible fixed maturities |  | 121.7 |  |  | 127.4 |  |  | 127.4 |
Other long-term investments |  | 257.2 |  |  | 294.2 |  |  | 294.2 |
Total investments (1) |  | $ | 7,359.3 |  |  | $ | 7,616.2 |  |  | $ | 7,616.2 |
(1) | Carrying value and fair value includes $338.1 that is classified as assets held for sale relating to discontinued operations.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: 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=6955306&loc=d3e611379-123010 + Details
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