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Income Taxes - Income tax (benefit) expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current
Federal	$ 111.2	$ 96.4	$ 71.1
State	22.9	21.0	11.1
Foreign	6.5	5.2	13.2
Current	140.6	122.6	95.4
Deferred
Federal	(22.8)	(10.7)	(9.7)
State	(12.6)	(11.8)	0.0
Foreign	(0.1)	(0.4)	0.0
Deferred	(35.5)	(22.9)	(9.7)
Income tax expense	$ 105.1	$ 99.7	$ 85.7

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