Taxes on Income - Schedule of Taxes on Income (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Current expense [Abstract]
Federal	$ 226.7	$ 154.9	$ 343.4
State	50.3	28.8	37.0
Non-U.S.	68.9	54.2	66.8
Deferred expense (benefit)	3.7	(7.1)	(4.9)
Total	$ 349.6	$ 230.8	$ 442.3

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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