Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net (loss) income attributable to common stockholders	$ (22.4)	$ 45.3
Basic weighted average shares outstanding	257.0	254.7
Effect of dilutive stock options and non-participating securities		2.0
Diluted weighted average shares outstanding	257.0	256.7
Basic (loss) earnings per share attributable to common stockholders	$ (0.09)	$ 0.18
Diluted (loss) earnings per share attributable to common stockholders	$ (0.09)	$ 0.18