Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2021

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,	2021		2020		2019
Stock and stock unit awards	$	165.2	$	117.1	$	105.7
Employee stock investment plan	6.7		5.2		5.8
Phantom unit awards	30.4		2.7		1.7
Total	$	202.3	$	125.0	$	113.2

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, 2021
Nonvested balance at September 30, 2020	12,141	4,808	16,949	$	24.30
Granted	5,906	240	6,146	21.08
Vested	(3,500)	(619)	(4,119)	26.56
Forfeited/canceled	(570)	(572)	(1,142)	30.61
Modified	199	(199)	—	n/a
Nonvested balance at September 30, 2021	14,176	3,658	17,834	$	22.27