Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	50,000,000	50,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	500,000,000	500,000,000
Common stock, issued	107,800,000	106,600,000
Common stock, outstanding	94,400,000	93,600,000
Treasury Stock, shares	13,400,000	13,000,000
Series A Convertible Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, issued	500,000	500,000
Preferred stock, outstanding	500,000	500,000
Percentage of Cumulative Dividend	7.00%	7.00%
Preferred stock, Liquidation Preference	$ 512.0	$ 503.2