| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | S-1/A | 10-K | S-1 | S-1 |
| Revenues [Abstract] | | | | |
| Total income | 5.0 | 0.0 | 52.3 | 47.1 |
| Total income growth | 15718.7% | -99.9% | 11.0% | |
| Operating Expenses | | | | |
| General, administrative and other | | | 12.6 | 12.7 |
| Total operating expenses | | | 12.6 | 12.7 |
| Total operating income (loss) | -8.9 | -1.0 | -5.3 | -4.0 |
| Operating margin | -178.9% | | -10.1% | -8.6% |
| |
| Other Income (Expenses) | | | | |
| Gain (loss) on investments | | | 0.2 | 0.1 |
| Gain (loss) on warrant liability | 12.6 | 3.9 | | |
| Other income (expense) | -0.2 | 0.0 | | |
| Income (loss) before taxes | | | -3.7 | -3.2 |
| Income tax (expense) benefit | | | 0.3 | -0.5 |
| Net income (loss) | | | -3.4 | -3.7 |
| Net income (loss) attributed to non-controlling interests in subsidiaries | | | 1.5 | 1.0 |
| Net income (loss) attributable to AlTi Global, Inc. | 8.8 | -1.0 | | |
| |
| Other Comprehensive (Loss) Income | | | | |
| Foreign currency translation adjustments | | | 1.0 | -1.1 |
| |
| Total comprehensive income (loss) | | | | |
| Other income (loss) attributed to non-controlling interests in subsidiaries | | | | |
| |
| Net Income (Loss) Per Share | | | | |
| Basic (in dollars per share) | | ($0.03) | | |
| Diluted (in dollars per share) | | ($0.03) | | |
| |
| Weighted Average Shares of Class A Common Stock Outstanding | | | | |
| Basic (in shares) | 43.1 | 29.1 | | |
| Diluted (in shares) | 43.1 | | | |