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Severance - Schedule of Restructuring and Related Costs (Details) - Cost of services provided (exclusive of depreciation and amortization) / Selling and general corporate expenses
$ in Millions
9 Months Ended
Jun. 30, 2023
USD ($)
Restructuring Cost and Reserve [Line Items]  
Severance costs $ 36.3
Corporate  
Restructuring Cost and Reserve [Line Items]  
Severance costs 0.6
FSS United States  
Restructuring Cost and Reserve [Line Items]  
Severance costs 3.3
FSS International  
Restructuring Cost and Reserve [Line Items]  
Severance costs 25.8
Uniform  
Restructuring Cost and Reserve [Line Items]  
Severance costs $ 6.6