Interest Expense, Net - Summary of Components of Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest Income (Expense), Net [Abstract]
Interest expense	$ (92.4)	$ (114.0)	$ (275.6)	$ (314.4)
Interest income	13.9	11.5	37.9	34.6
Interest expense, net	$ (78.5)	$ (102.5)	$ (237.7)	$ (279.8)

Amount of the cost of borrowed funds accounted for as interest expense.

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