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Long-Term Debt (Tables)
12 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Long-term Debt
September 30,
20222021
7.00% Senior Notes maturing in March 2030$840.0 $— 
Term B Facility— 609.9 
Revolving credit facilities99.0 — 
   Total principal amount of debt939.0 609.9 
Less: Current portion of long-term debt— 116.3 
Debt issuance costs, net9.5 4.7 
Unamortized discount— 7.7 
Long-term debt$929.5 $481.2 
Schedule of Maturities of Long-term Debt
Fiscal 2023$— 
Fiscal 2024— 
Fiscal 2025— 
Fiscal 2026— 
Fiscal 202799.0