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Long-term Incentive Compensation Plans - Summary of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]    
Total amount of AB Holding Units Purchased/Retained (in shares) 0.2 0.8
Total Cash Paid for AB Holding Units Purchased/Retained $ 8.8 $ 30.5
Open Market Purchases of AB Holding Units Purchased (in shares) 0.1 0.7
Total Cash Paid for Open Market Purchases of AB Holding Units $ 4.7 $ 26.1