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Debt - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 22, 2024
Sep. 30, 2024
Feb. 22, 2023
Jan. 22, 2021
Debt Instrument [Line Items]            
Short term borrowing interest rate 7.70%     7.30%    
Loss on extinguishment of debt $ 0.1 $ 0.5        
Notes payable 1.7     $ 2.1    
Interest Rate Contracts            
Debt Instrument [Line Items]            
Fixed interest rate         1.042%  
Notional value $ 600.0         $ 600.0
Notional value decrease each year     $ 100.0      
Senior Secured Term Loan A Facility, Due 2027 | Secured Debt            
Debt Instrument [Line Items]            
Stated interest rate of debt 0.25%          
Face amount of debt $ 3.0          
Senior Secured Term Loan B Facility due 2027 | Secured Debt            
Debt Instrument [Line Items]            
Premiums paid on extinguishment of debt 22.0 75.0        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Outstanding letters of credit 0.0 $ 0.0        
Amount available remaining 492.4          
Letter of Credit            
Debt Instrument [Line Items]            
Outstanding letters of credit $ 7.6