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Held for Sale and Discontinued Operations - Financial Statement Disclosure (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Net income (loss) income from NSM Group discontinued operations | $ 6.4 | $ 1.1 | $ 10.1 | $ (29.1) |  |
Gain (loss) from sale of Sirius Group, net of tax | 0.0 | 0.0 | 0.0 | 18.7 |  |
Total income (loss) from discontinued operations, net of tax | (6.4) | (1.1) | (10.1) | 10.4 |  |
Net (income) loss from discontinued operations attributable to non-controlling interests | (0.5) | 0.0 | (0.6) | 1.1 |  |
Other comprehensive income (loss) from NSM Group discontinued operations, net of tax | (4.0) | 0.5 | (5.9) | 2.6 |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Net cash provided from (used for) operations |  |  | 36.7 | 42.4 |  |
Net cash provided from (used for) investing activities |  |  | 7.1 | (2.6) |  |
Net cash used from (used for) financing activities |  |  | (16.9) | (11.2) |  |
Net change in cash during the period |  |  | 235.7 | 87.3 |  |
Cash balances at beginning of period (includes restricted cash balances of $4.5 and $— and excludes discontinued operations cash balances of $111.6 and $126.6) |  |  | 147.7 | 84.6 |  |
Cash balances at end of period (includes restricted cash balances of $7.3 and $4.0 and excludes discontinued operations cash balances of $142.7 and 154.8) | 383.4 | 171.9 | 383.4 | 171.9 |  |
Restricted cash balance | 7.3 | 4.0 | 7.3 | 4.0 | $ 4.5 | $ 0.0
Interest paid |  |  | 6.3 | 3.4 |  |
Net income tax payments |  |  | 3.8 | 2.1 |  |
Discontinued Operations, Held-for-sale | NSM Insurance Group |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |  |  |  |  |
Short-term investments, at fair value | 0.0 |  | 0.0 |  | 7.8 |
Cash (restricted $108.9 and $89.2) | 142.7 |  | 142.7 |  | 111.6 |
Restricted cash | 108.9 |  | 108.9 |  | 89.2 |
Premiums and commissions receivable | 97.8 |  | 97.8 |  | 85.0 |
Goodwill and other intangible assets | 698.1 |  | 698.1 |  | 725.4 |
Other assets | 59.1 |  | 59.1 |  | 59.2 |
Total assets held for sale | 997.7 |  | 997.7 |  | 989.0 |
Debt | 261.7 |  | 261.7 |  | 272.1 |
Premiums payable | 163.4 |  | 163.4 |  | 135.9 |
Contingent consideration | 0.0 |  | 0.0 |  | 6.8 |
Other liabilities | 79.3 |  | 79.3 |  | 80.5 |
Total liabilities held for sale | 504.4 |  | 504.4 |  | 495.3 |
Net assets held for sale | 493.3 |  | 493.3 |  | 493.7 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |  |  |  |
Commission revenues | 80.2 | 68.0 | 150.3 | 127.6 |  |
Other revenues | 22.7 | 16.3 | 41.1 | 31.5 |  |
Total revenues - NSM Group | 102.9 | 84.3 | 191.4 | 159.1 |  |
General and administrative expenses | 57.1 | 47.7 | 111.1 | 93.5 |  |
Broker commission expenses | 24.1 | 21.6 | 44.7 | 40.5 |  |
Change in fair value of contingent consideration | 0.0 | 0.0 | 0.1 | 0.2 |  |
Amortization of other intangible assets | 0.0 | 8.2 | 9.1 | 16.8 |  |
Loss on assets held for sale | 0.0 | 0.0 | 0.0 | (28.7) |  |
Interest expense | 8.4 | 5.9 | 10.5 | 11.8 |  |
Total expenses - NSM Group | 89.6 | 83.4 | 175.5 | 191.5 |  |
Pre-tax income (loss) from NSM Group discontinued operations | 13.3 | 0.9 | 15.9 | (32.4) |  |
Income tax (expense) benefit | (6.9) | 0.2 | (5.8) | 3.3 |  |
Net income (loss) income from NSM Group discontinued operations | 6.4 | 1.1 | 10.1 | (29.1) |  |
Gain (loss) from sale of Sirius Group, net of tax | 0.0 | 0.0 | 0.0 | 18.7 |  |
Total income (loss) from discontinued operations, net of tax | 6.4 | 1.1 | 10.1 | (10.4) |  |
Net (income) loss from discontinued operations attributable to non-controlling interests | (0.5) | 0.0 | (0.6) | 1.1 |  |
Total income (loss) from discontinued operations attributable to White Mountains’s common shareholders | 5.9 | 1.1 | 9.5 | (9.3) |  |
Other comprehensive income (loss) from NSM Group discontinued operations, net of tax | (4.0) | 0.5 | (5.9) | 2.6 |  |
Comprehensive income (loss) from discontinued operations | 1.9 | 1.6 | 3.6 | (6.7) |  |
Other comprehensive income (loss) from NSM discontinued operations attributable to non-controlling interests | 0.2 | 0.0 | 0.3 | (0.1) |  |
Comprehensive income (loss) from discontinued operations attributable to White Mountains’s common shareholders | 2.1 | 1.6 | 3.9 | (6.8) |  |
Net Cash Provided by (Used in) Discontinued Operations [Abstract] |  |  |  |  |  |
Net cash provided from (used for) operations |  |  | 36.7 | 42.4 |  |
Net cash provided from (used for) investing activities |  |  | 7.1 | (2.6) |  |
Net cash used from (used for) financing activities |  |  | (16.9) | (11.2) |  |
Effect of exchange rate changes on cash |  |  | 4.2 | (0.4) |  |
Net change in cash during the period |  |  | 31.1 | 28.2 |  |
Cash balances at beginning of period (includes restricted cash balances of $4.5 and $— and excludes discontinued operations cash balances of $111.6 and $126.6) |  |  | 111.6 | 126.6 |  |
Cash balances at end of period (includes restricted cash balances of $7.3 and $4.0 and excludes discontinued operations cash balances of $142.7 and 154.8) | 142.7 | 154.8 | 142.7 | 154.8 |  |
Restricted cash balance | $ 108.9 | $ 90.3 | 108.9 | 90.3 | $ 89.2 | $ 78.4
Interest paid |  |  | 10.4 | 11.1 |  |
Net income tax payments |  |  | $ 0.0 | $ 0.0 |  |

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