Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
Unrecognized tax benefits	$ 27.2		$ 27.2		$ 23.9
Income tax provision upon recognition of unrecognized tax benefit	27.2		27.2
Unrecognized tax benefits that would impact valuation allowance	5.4		5.4
Potential decrease in unrecognized tax benefits	$ (5.0)		(5.0)
Income tax payments			$ 41.2	$ 28.4

Income tax disclosure [Line Items]

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- Definition

Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Resulting Change in Valuation Allowance

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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