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Long-Term Debt (Tables)
3 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Long-term Debt
December 31,
2020
September 30,
2020
Term B Facility$636.2 $673.7 
Revolving Credit Facility50.0 30.0 
Total principal amount of debt686.2 703.7 
Less: Current portion of long-term debt35.0 63.8 
Debt issuance costs, net6.2 6.6 
Unamortized discount9.9 10.7 
Long-term debt$635.1 $622.6