Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Total	$ 1,441.0	$ 1,284.0
Long-term debt	1,433.1	1,275.0
Notes payable	27.2	24.5
Unamortized debt issuance costs	$ 7.9	9.0
Short-Term Debt, Weighted Average Interest Rate, at Point in Time	3.80%
Senior notes \| Senior Notes, Due 2028
Debt Instrument [Line Items]
Total	$ 750.0	750.0
Unamortized debt issuance costs	4.7	5.4
Senior notes \| Senior Notes, Due 2029
Debt Instrument [Line Items]
Total	500.0	500.0
Unamortized debt issuance costs	3.2	3.6
Revolving credit facility
Debt Instrument [Line Items]
Total	$ 191.0	$ 34.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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