Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Capital lease obligations	$ 47.6	$ 49.2
Long-term Debt and Lease Obligation	3,152.6	3,230.0
Less current portion	(13.0)	(12.6)
Less unamortized debt premium and debt issuance fees	(22.3)	(24.4)
Total long-term debt	3,117.3	3,193.0
Secured Debt \| Senior Secured Term Loan A Facility, Due 2027
Debt Instrument [Line Items]
Total long-term debt, including current maturities	$ 757.0	782.0
Stated interest rate of debt	0.25%
Senior Notes \| Senior Notes, 6.500%, Due 2027
Debt Instrument [Line Items]
Total long-term debt, including current maturities	$ 300.0	300.0
Senior Notes \| Senior Notes, 4.750%, Due 2028
Debt Instrument [Line Items]
Total long-term debt, including current maturities	583.7	583.7
Senior Notes \| Senior Notes, 4.375%, Due 2029
Debt Instrument [Line Items]
Total long-term debt, including current maturities	791.3	791.3
Senior Notes \| 3.50% Senior Notes due 2029
Debt Instrument [Line Items]
Total long-term debt, including current maturities	$ 673.0	$ 723.8
Stated interest rate of debt	3.50%

Contractual interest rate for funds borrowed, under the debt agreement.

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