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Long-Term Debt (Tables)
12 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Long-term Debt
September 30,
2020
Term B Facility$673.7 
Revolving Credit Facility30.0 
703.7 
Less: Current portion of long-term debt63.8 
Debt issuance costs, net6.6 
Unamortized discount10.7 
Long-term debt$622.6