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Debt - Schedule of Short-Term Borrowings and Long Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Debt issuance costs and discounts	$ (19.3)	$ (6.6)
Total debt	1,657.7	1,074.0
Current portion of long-term debt	31.2	23.8
Long-term debt	1,626.5	1,050.2
Revolver
Debt Instrument [Line Items]
Total borrowing capacity remaining	475.0
Line of Credit | Revolver
Debt Instrument [Line Items]
Gross debt	0.0	130.0
Total borrowing capacity remaining	470.1
Letters of credit outstanding	4.9
2031 Notes | Senior Notes
Debt Instrument [Line Items]
Gross debt	535.0	535.0
Term Loan A | Line of Credit
Debt Instrument [Line Items]
Gross debt	403.8	415.6
Term Loan B | Line of Credit
Debt Instrument [Line Items]
Gross debt	$ 738.2	$ 0.0

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