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Long-term Incentive Compensation Plans - Unit Purchase Activity (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]        
Total amount of AB Holding Units Purchased (in shares) 0.4 0.9 1.2 1.0
Total Cash Paid for AB Holding Units Purchased $ 13.2 $ 29.0 $ 43.7 $ 33.3
Open Market Purchases of AB Holding Units Purchased (in shares) 0.3 0.6 1.0 0.6
Total Cash Paid for Open Market Purchases of AB Holding Units $ 12.3 $ 21.5 $ 38.4 $ 21.5