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Long-Term Debt - Debt Outstanding (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Feb. 10, 2022
Sep. 30, 2021
Debt Instrument [Line Items]      
Principal debt issued $ 1,450.0    
Less: current debt obligations (9.5)   $ 0.0
Less: debt issuance costs and discounts (36.8)    
Long-term debt 1,403.7   $ 0.0
Secured Debt | Senior Secured Term Loan B maturing March 2029      
Debt Instrument [Line Items]      
Principal debt issued 950.0    
Senior Notes | 5.00% Senior Secured Notes due February 2030      
Debt Instrument [Line Items]      
Stated interest rate   5.00%  
Principal debt issued $ 500.0