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SHARE-BASED COMPENSATION PROGRAMS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) tranche shares | Dec. 31, 2023 USD ($) tranche shares | Dec. 31, 2022 USD ($) tranche shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued (in shares) | 0 | 0 | 0
Alliance Bernstein |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares repurchased (in shares) | 4,500,000 | 4,700,000 | 5,200,000
Payments for repurchase of other equity | $ | $ 156,000 | $ 144,000 | $ 212,000
Open market purchases (in shares) | 1,800,000 | 2,000,000.0 | 2,300,000
Open-market purchases, value | $ | $ 60,100 | $ 62,600 | $ 92,700
Proceeds from options exercised | $ |  |  | $ 100
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Granted (in shares) | 1,444,000 |  |
Unvested restricted shares and holding units (in shares) | 2,700,000 |  |
Compensation cost not yet recognized | $ | $ 35,000 |  |
Compensation cost, recognition period | 1 year 7 months 6 days |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued (in shares) | 0 |  |
Stock Options | Vesting tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 33.33% |  |
Stock Options | Vesting tranche two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 33.33% |  |
Stock Options | Vesting tranche three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 33.33% |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of tranches | tranche | 2 | 1 | 1
Unvested restricted shares and holding units (in shares) | 1,300,000 |  |
Compensation cost not yet recognized | $ | $ 14,000 |  |
Compensation cost, recognition period | 1 year 6 months |  |
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of potential shares earned | 0.00% | 0.00% | 0.00%
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of potential shares earned | 200.00% | 200.00% | 200.00%
Performance Shares | Vesting tranche one |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 50.00% |  |
Performance Shares | Vesting tranche two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 50.00% |  |
AB Holding Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant (in shares) | 24,000,000 | 27,000,000 |
Unvested restricted shares and holding units (in shares) | 12,000,000 |  |
Compensation cost not yet recognized | $ | $ 94,000 |  |
Compensation cost, recognition period | 5 years 4 months 24 days |  |
AB Holding Units | Alliance Bernstein |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issued (in shares) | 0 | 0 | 6,000
Restricted AB Holding Units | Alliance Bernstein |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 5,900,000 | 5,600,000 | 4,700,000
Omnibus Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved and available for issuance (in shares) | 17,000,000 |  |
2017 Plan | AB Holding Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved and available for issuance (in shares) | 60,000,000 |  |
Shares available for grant (in shares) | 36,000,000 | 33,000,000 |
2017 Plan | Newly Issued AB Holding Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved and available for issuance (in shares) | 30,000,000 |  |

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