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Severance - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Accrued Payroll and Related Expenses | Employee Severance and Other Costs    
Restructuring Cost and Reserve [Line Items]    
Severance and related costs accrual $ 31.0 $ 31.0
Cost of services provided (exclusive of depreciation and amortization) / Selling and general corporate expenses    
Restructuring Cost and Reserve [Line Items]    
Severance costs $ 36.3 $ 36.3