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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments [Abstract] |  |
Other long-term investments | $ 1,377.8 | $ 786.8
Total investments | 4,265.3 | 2,939.0
Total assets | 7,000.7 | 4,831.4
Liabilities |  |
Debt | 693.0 | 376.4
Total liabilities | 3,296.0 | 1,013.5
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 3,017,772 and 3,102,011 shares | 3.0 | 3.1
Paid-in surplus | 585.9 | 592.1
Retained earnings | 2,957.5 | 3,311.2
Accumulated other comprehensive gain (loss), after-tax: |  |
Net unrealized foreign currency translation and interest rate swap gains (losses) | 1.7 | (0.4)
Total White Mountains’s common shareholders’ equity | 3,548.1 | 3,906.0
Non-controlling interests | 156.6 | (88.1)
Total equity | 3,704.7 | 3,817.9
Total liabilities and equity | 7,000.7 | 4,831.4
HG Global-BAM |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 934.1 | 859.5
Short-term investments, at fair value | 32.4 | 60.4
Total investments | 966.5 | 919.9
Cash | 19.8 | 42.8
Insurance premiums receivable | 6.9 | 6.9
Deferred acquisition costs | 33.1 | 27.8
Other assets | 18.5 | 20.4
Total assets | 1,044.8 | 1,017.8
Liabilities |  |
Unearned insurance premiums | 266.3 | 237.5
Accrued incentive compensation | 24.7 | 25.7
Other liabilities | 30.9 | 28.3
Total liabilities | 321.9 | 291.5
Ark |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 688.6 | 0.0
Short-term investments, at fair value | 296.2 | 0.0
Common equity securities, at fair value | 251.1 | 0.0
Other long-term investments | 326.2 | 0.0
Total investments | 1,562.1 | 0.0
Cash | 67.8 | 0.0
Reinsurance recoverables | 448.4 | 0.0
Cash pre-funded/placed in escrow for Ark Transaction |  | 366.3
Insurance premiums receivable | 416.0 | 0.0
Ceded unearned premiums | 67.1 | 0.0
Deferred acquisition costs | 108.2 | 0.0
Goodwill and other intangible assets | 292.5 | 0.0
Other assets | 64.9 | 0.0
Total assets | 3,027.0 | 0.0
Liabilities |  |
Loss and loss adjustment expense reserves | 894.7 | 0.0
Unearned insurance premiums | 495.9 | 0.0
Debt | 185.9 | 0.0
Reinsurance payable | 424.1 | 0.0
Contingent consideration | 28.0 | 0.0
Other liabilities | 93.8 | 0.0
Total liabilities | 2,122.4 | 0.0
Accumulated other comprehensive gain (loss), after-tax: |  |
Non-controlling interests | 230.7 | 0.0
NSM |  |
Investments [Abstract] |  |
Cash | 111.5 | 126.5
Premium and commission receivable | 85.0 | 76.7
Goodwill and other intangible assets | 725.4 | 736.8
Other assets | 55.4 | 59.6
Total assets | 977.3 | 999.6
Liabilities |  |
Debt | 272.1 | 272.6
Premiums payable | 135.9 | 113.4
Contingent consideration | 6.8 | 14.6
Other liabilities | 80.5 | 91.2
Total liabilities | 495.3 | 491.8
Kudu |  |
Investments [Abstract] |  |
Other long-term investments | 669.5 | 400.6
Cash | 21.4 | 7.8
Accrued investment income | 16.9 | 9.8
Goodwill and other intangible assets | 8.9 | 9.2
Other assets | 10.4 | 2.8
Total assets | 727.1 | 430.2
Liabilities |  |
Debt | 218.2 | 86.3
Other liabilities | 42.8 | 10.0
Total liabilities | 261.0 | 96.3
Other Operations |  |
Investments [Abstract] |  |
Fixed maturity investments, at fair value | 286.2 | 347.7
Short-term investments, at fair value | 137.3 | 82.4
Investment in MediaAlpha, at fair value | 261.6 | 802.2
Other long-term investments | 382.1 | 386.2
Total investments | 1,067.2 | 1,618.5
Cash | 38.8 | 34.1
Cash pre-funded/placed in escrow for Ark Transaction | 0.0 | 646.3
Goodwill and other intangible assets | 39.1 | 36.4
Other assets | 63.3 | 46.2
Assets held for sale | 16.1 | 2.3
Total assets | 1,224.5 | 2,383.8
Liabilities |  |
Debt | 16.8 | 17.5
Accrued incentive compensation | 48.5 | 70.1
Other liabilities | 30.1 | 46.3
Total liabilities | $ 95.4 | $ 133.9

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