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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investments [Abstract] |  |
Common equity securities, at fair value | $ 538.4 | $ 668.4
Other long-term investments | 1,998.2 | 1,488.0
Total investments | 6,388.7 | 5,170.0
Goodwill and other intangible assets | 370.6 | 392.4
Total assets | 8,385.9 | 7,389.3
Liabilities |  |
Debt | 564.6 | 575.2
Total liabilities | 3,824.3 | 3,454.3
White Mountains’s common shareholders’ equity |  |
White Mountains’s common shares at $1 par value per share—authorized 50,000,000 shares; issued and outstanding 2,560,452 and 2,572,156 shares | 2.6 | 2.6
Paid-in surplus | 548.7 | 536.0
Retained earnings | 3,690.8 | 3,211.8
Accumulated other comprehensive income (loss), after-tax: |  |
Net unrealized gains (losses) from foreign currency translation and interest rate swap | (1.6) | (3.5)
Total White Mountains’s common shareholders’ equity | 4,240.5 | 3,746.9
Noncontrolling interests | 321.1 | 188.1
Total equity | 4,561.6 | 3,935.0
Total liabilities and equity | 8,385.9 | 7,389.3
Ark/WM Outrigger |  |
Liabilities |  |
Loss and loss adjustment expense reserves | 1,605.1 | 1,296.5
Operating Segments | HG Global/BAM - Segment |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 1,012.3 | 909.9
Short-term investments, at fair value | 70.6 | 65.9
Total investments | 1,082.9 | 975.8
Cash | 6.7 | 18.2
Insurance premiums receivable | 5.5 | 6.6
Deferred acquisition costs | 40.1 | 36.0
Other assets | 36.8 | 21.9
Total assets | 1,172.0 | 1,058.5
Liabilities |  |
Unearned insurance premiums | 325.8 | 298.3
Debt | 146.9 | 146.5
Accrued incentive compensation | 27.2 | 28.0
Other liabilities | 31.8 | 29.0
Total liabilities | 531.7 | 501.8
Accumulated other comprehensive income (loss), after-tax: |  |
Total White Mountains’s common shareholders’ equity | 779.3 | 712.0
Noncontrolling interests | (139.0) | (155.3)
Operating Segments | Ark/WM Outrigger |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 866.8 | 772.8
Common equity securities, at fair value | 400.6 | 334.6
Short-term investments, at fair value | 962.8 | 484.6
Other long-term investments | 440.9 | 373.6
Total investments | 2,671.1 | 1,965.6
Cash | 90.5 | 101.5
Reinsurance recoverables | 442.0 | 595.3
Insurance premiums receivable | 612.2 | 544.1
Deferred acquisition costs | 145.3 | 127.2
Goodwill and other intangible assets | 292.5 | 292.5
Other assets | 125.0 | 65.2
Total assets | 4,378.6 | 3,691.4
Liabilities |  |
Loss and loss adjustment expense reserves | 1,605.1 | 1,296.5
Unearned insurance premiums | 743.6 | 623.2
Debt | 185.5 | 183.7
Reinsurance payable | 81.1 | 251.1
Contingent consideration | 94.0 | 45.3
Other liabilities | 166.8 | 122.3
Total liabilities | 2,876.1 | 2,522.1
Accumulated other comprehensive income (loss), after-tax: |  |
Total White Mountains’s common shareholders’ equity | 1,165.6 | 921.4
Noncontrolling interests | 336.9 | 247.9
Operating Segments | Kudu |  |
Investments [Abstract] |  |
Short-term investments, at fair value | 29.3 | 0.0
Other long-term investments | 896.3 | 695.9
Total investments | 925.6 | 695.9
Cash | 1.4 | 101.4
Accrued investment income | 17.6 | 12.4
Goodwill and other intangible assets | 8.3 | 8.6
Other assets | 6.5 | 7.6
Total assets | 959.4 | 825.9
Liabilities |  |
Debt | 203.8 | 208.3
Other liabilities | 71.6 | 65.0
Total liabilities | 275.4 | 273.3
Accumulated other comprehensive income (loss), after-tax: |  |
Total White Mountains’s common shareholders’ equity | 570.2 | 477.5
Noncontrolling interests | 113.8 | 75.1
Other Operations |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 230.2 | 238.2
Common equity securities, at fair value | 137.8 | 333.8
Investment in MediaAlpha, at fair value | 254.9 | 168.6
Short-term investments, at fair value | 425.2 | 373.6
Other long-term investments | 661.0 | 418.5
Total investments | 1,709.1 | 1,532.7
Cash | 23.8 | 33.9
Goodwill and other intangible assets | 69.8 | 91.3
Other assets | 73.2 | 155.6
Total assets | 1,875.9 | 1,813.5
Liabilities |  |
Debt | 28.4 | 36.7
Accrued incentive compensation | 87.7 | 86.1
Other liabilities | 25.0 | 34.3
Total liabilities | 141.1 | 157.1
Accumulated other comprehensive income (loss), after-tax: |  |
Total White Mountains’s common shareholders’ equity | 1,725.4 | 1,636.0
Noncontrolling interests | $ 9.4 | $ 20.4

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