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Long-Term Debt (Tables)
9 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Long-term Debt
June 30,
2021
September 30,
2020
Term B Facility$618.7 $673.7 
Revolving Credit Facility— 30.0 
Total principal amount of debt618.7 703.7 
Less: Current portion of long-term debt114.5 63.8 
Debt issuance costs, net5.1 6.6 
Unamortized discount8.4 10.7 
Long-term debt$490.7 $622.6