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SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-15, Insurance Companies, 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, 2019
Millions |  | Cost |  | Carrying Value |  | Fair Value
Fixed maturity investments: |  |  |  |  |  |  |  |  |
U.S. Government and agency obligations |  | $ | 231.7 |  |  | $ | 232.5 |  |  | $ | 232.5 |
Debt securities issued by corporations |  | 454.9 |  |  | 467.2 |  |  | 467.2 |
Municipal obligations |  | 284.7 |  |  | 297.1 |  |  | 297.1 |
Mortgage and asset-backed securities |  | 206.6 |  |  | 209.0 |  |  | 209.0 |
Total fixed maturity investments |  | 1,177.9 |  |  | 1,205.8 |  |  | 1,205.8 |
Short-term investments |  | 201.2 |  |  | 201.2 |  |  | 201.2 |
Common equity securities: |  |  |  |  |  |
Exchange traded funds |  | 436.0 |  |  | 536.4 |  |  | 536.4 |
Other |  | 117.3 |  |  | 147.5 |  |  | 147.5 |
Total common equity securities |  | 553.3 |  |  | 683.9 |  |  | 683.9 |
Other long-term investments |  | 667.4 |  |  | 856.3 |  |  | 856.3 |
Total investments |  | $ | 2,599.8 |  |  | $ | 2,947.2 |  |  | $ | 2,947.2 |

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- Definition The entire disclosure of information about investment held by insurance company, excluding investment in related party. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 15 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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