v3.26.1
Debt - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Mar. 19, 2025
Dec. 22, 2024
Feb. 22, 2023
Jan. 22, 2021
Dec. 31, 2020
Debt Instrument [Line Items]                      
Debt issuance costs       $ (1.5) $ (8.0)            
Loss on extinguishment of debt       $ (0.9) (1.1)            
Short term borrowing interest rate 5.90%     5.90%   4.40%          
Loss on extinguishment/modification of debt $ 0.0 $ 0.0 $ 5.2 $ 0.9 5.3            
Notes payable 30.5     30.5   $ 13.7          
Interest Rate Contracts                      
Debt Instrument [Line Items]                      
Fixed interest rate                 1.042%    
Notional value $ 500.0     $ 500.0           $ 500.0  
Notional value decrease each year               $ 100.0      
Senior Secured Term Loan Facility Due 2032 | Secured Debt                      
Debt Instrument [Line Items]                      
Stated interest rate of debt 0.25%     0.25%              
Senior Secured Term Loan Facility Due 2032 | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Face amount of debt                     $ 760.0
Repayments of Debt $ 90.0       $ 22.0            
Senior Secured Term Loan A Facility, Due 2027 | Secured Debt                      
Debt Instrument [Line Items]                      
Face amount of debt 2.2     $ 2.2              
Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Amount available remaining 462.4     462.4              
Revolving Credit Facility | Credit Agreement, Revolving Facility | Line of Credit [Member]                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity             $ 500.0        
Outstanding letters of credit 30.0     30.0              
Letter of Credit                      
Debt Instrument [Line Items]                      
Outstanding letters of credit $ 7.6     $ 7.6