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Income Taxes - Schedule of Components of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Current:
Federal	$ (94.7)	$ 70.1	$ 140.9
Foreign	8.5	8.2	(0.2)
State	22.8	12.1	20.2
Total current	(63.4)	90.4	160.9
Deferred:
Federal	108.1	14.3	2.1
Foreign	(5.6)	9.7	7.3
State	(13.9)	(1.6)	1.0
Total deferred	88.6	22.4	10.4
Provision for income taxes	25.2	112.8	171.3
Allocated to Other Comprehensive Income (Loss)
Deferred federal, state and foreign	$ (20.0)	$ 8.8	$ (14.9)

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The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations and reclassified to other comprehensive income (loss).

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