Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Statement of Financial Position [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 4.0	$ 4.2
Preferred Stock, Par or Stated Value Per Share	$ 0.10	$ 0.10
Preferred Stock, Shares Authorized	30,000,000	30,000,000
Preferred Stock, Shares Issued	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued	398,939,929	397,190,100
Common Stock, Shares, Outstanding	351,955,435	356,015,843
Treasury Stock, Shares	46,984,494	41,174,257