CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 60.1	$ 60.2
Other current assets amount related to SPEs	0.0	862.1
Other noncurrent assets amount related to SPEs	384.4	382.7
Other current liabilities amount related to SPEs	0.0	776.7
Other noncurrent liabilities amount related to SPEs	$ 331.1	$ 330.2
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	30,000,000	30,000,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	600,000,000	600,000,000
Common Stock, Shares, Outstanding	258,100,000	256,400,000