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HELD-FOR-SALE - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2024
USD ($)
Nov. 22, 2022
Jun. 30, 2024
USD ($)
holdingCompany
Jun. 30, 2024
USD ($)
director
holdingCompany
Dec. 31, 2023
USD ($)
holdingCompany
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Liability recorded     $ 0.0 $ 0.0 $ 153.0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Corporate Solutions Life Reinsurance Company          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Liability recorded         $ 153.0
NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of directors included on the Board of Directors | director       2  
AB Holding And Societe Generale | JVs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of joint venture | holdingCompany     2 2 2
AB Holding And Societe Generale | Outside NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of joint venture | holdingCompany         1
AB Holding And Societe Generale | NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of joint venture | holdingCompany         1
AB Holding | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Alliance Bernstein Research Services Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Recognized revenues     $ 12.4    
Net carrying amount of assets and liabilities included in sale     312.0 $ 312.0  
Pre-tax gain on divestiture     135.0    
Liability recorded     103.0 103.0  
AB Holding | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Corporate Solutions Life Reinsurance Company          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Non cash valuation adjustment         $ 7.0
AB Holding | JVs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Investment in consolidated subsidiaries     $ 284.0 $ 284.0  
AB Holding | JVs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Interest in joint venture   49.00%      
Period for option to sell ownership interest in joint venture 5 years        
AB Holding | NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Interest in joint venture 66.70%        
Number of directors included on the Board of Directors | director       4  
Societe Generale | JVs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash payment to equalize value of investment $ 304.0        
Prepaid consideration $ 103.0        
Societe Generale | JVs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Interest in joint venture   51.00%      
Expected interest in joint venture 100.00% 100.00%      
Period to reach expected interest in joint venture 5 years 5 years      
Exercise period to increase ownership interest in joint venture 5 years        
Societe Generale | Outside NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Interest in joint venture 51.00%        
Societe Generale | NA JV          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Interest in joint venture 51.00%   51.00% 51.00%  
Number of directors included on the Board of Directors | director       3