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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Percent 23.10% (9.80%)  
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount   $ 1.0  
Investments, Owned, Federal Income Tax Note [Line Items]      
CARES Act NOL Carryback Benefit $ 0.3   $ 5.2
CARES Act Deferred Payroll Tax Liability 11.1    
Prior Year Carryback Income Tax Receivable      
Investments, Owned, Federal Income Tax Note [Line Items]      
Increase (Decrease) in Income Taxes Receivable 13.6    
Prior Year Overpayment Income Tax Receivable      
Investments, Owned, Federal Income Tax Note [Line Items]      
Increase (Decrease) in Income Taxes Receivable $ 2.4