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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 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]    
Severance costs $ 36.3 $ 36.3
Corporate    
Restructuring Cost and Reserve [Line Items]    
Severance costs 0.6 0.6
FSS United States    
Restructuring Cost and Reserve [Line Items]    
Severance costs 3.3 3.3
FSS International    
Restructuring Cost and Reserve [Line Items]    
Severance costs 25.8 25.8
Uniform    
Restructuring Cost and Reserve [Line Items]    
Severance costs $ 6.6 $ 6.6