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Long-Term Debt (Tables)
6 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Long-term Debt
March 31,
2022
September 30,
2021
7.00% Senior Notes maturing in March 2030$840.0 $— 
Term B Facility— 609.9 
Revolving credit facilities109.0 — 
Total principal amount of debt949.0 609.9 
Less: Current portion of long-term debt— 116.3 
Debt issuance costs, net10.2 4.7 
Unamortized discount— 7.7 
Long-term debt$938.8 $481.2