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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract]  
Summary of stock-based compensation expenses
Stock-based compensation expenses were as follows:
(in millions)
for the fiscal years ended September 30,202520242023
Stock and stock unit awards$207.9 $240.3 $174.7 
Phantom unit awards11.8 13.8 33.2 
Employee stock investment plan6.9 5.8 7.9 
Total$226.6 $259.9 $215.8 
Summary of stock and stock unit award activity
Stock and stock unit award activity was as follows:
(shares in thousands)Time-Based
Shares		Performance-
Based Shares		Total
Shares		Weighted-Average
Grant-Date
Fair Value
for the fiscal year ended September 30, 2025
Nonvested balance at beginning of year
16,594 3,314 19,908 $24.03 
Granted8,553 169 8,722 20.97 
Vested(9,491)(166)(9,657)23.74 
Forfeited/canceled(697)(2,964)(3,661)22.60 
Nonvested Balance at End of Year
14,959 353 15,312 $22.81