Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Statement of Financial Position [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 4.1	$ 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	398,162,095	397,190,100
Common Stock, Shares, Outstanding	354,277,601	356,015,843
Treasury Stock, Shares	43,884,494	41,174,257