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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Statement of Financial Position [Abstract]    
Investments, at fair value $ 867.3 $ 613.5
Preferred Stock, Par or Stated Value Per Share $ 1.00 $ 1.00
Preferred Stock, Shares Authorized 1,000,000 1,000,000
Common Stock, Par or Stated Value Per Share $ 0.10 $ 0.10
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000
Common Stock, Shares, Issued 499,012,841 499,575,175
Common Stock, Shares, Outstanding 499,012,841 499,575,175