Interest Expense, Net - Summary of Components of Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Interest Income (Expense), Net [Abstract]
Interest expense	$ (139.5)	$ (118.9)
Interest income	38.1	21.6
Interest expense, net	$ (101.4)	$ (97.3)