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Long-term Incentive Compensation Plans - Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]    
Total amount of AB Holding Units Purchased (in shares) 0.1 0.5
Total Cash Paid for AB Holding Units Purchased $ 4.3 $ 18.8
Open Market Purchases of AB Holding Units Purchased (in shares) 0.0 0.0
Total Cash Paid for Open Market Purchases of AB Holding Units $ 0.0 $ 0.0