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Severance - Severance Charges by Segment (Details)
$ in Millions
9 Months Ended
Jun. 30, 2023
USD ($)
Restructuring Cost and Reserve [Line Items]  
Severance costs $ 29.7
Corporate  
Restructuring Cost and Reserve [Line Items]  
Severance costs 0.6
FSS United States | Operating Segments  
Restructuring Cost and Reserve [Line Items]  
Severance costs 3.3
FSS International | Operating Segments  
Restructuring Cost and Reserve [Line Items]  
Severance costs $ 25.8