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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 299.1	$ 149.5	$ 784.1	$ 377.6
Effective tax rate (percent)	21.10%	19.10%	21.60%	19.60%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	1.90%	3.10%	0.90%	2.80%
Deferred tax assets net of DTL	$ 154.4		$ 154.4		$ 152.4
Valuation allowance for deferred income taxes	$ 7.3		$ 7.3		$ 7.5

X

- Definition

The unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, before the valuation allowance.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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