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Summary of Significant Accounting Policies - Schedule of Repurchase Activity (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Accounting Policies [Abstract]    
Total amount of AB Holding Units Purchased (in units) 4.1 4.5
Total Cash Paid for AB Holding Units Purchased $ 162.1 $ 156.2
Open Market Purchases of AB Holding Units Purchased (in units) 1.9 1.8
Total Cash Paid for Open Market Purchases of AB Holding Units $ 72.1 $ 60.1