XML 151 R88.htm IDEA: XBRL DOCUMENT v3.25.3
DEBT - Schedule of Debt Repurchase Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]      
Gain Realized $ 0.0 $ 2.6 $ (3.0)
Senior Notes      
Debt Instrument [Line Items]      
Amounts Repurchased   180.1 61.4
Amounts Paid   172.9 52.7
Unamortized Debt Issuance Costs   2.5 0.8
Gain Realized   4.7 7.9
2029 Notes      
Debt Instrument [Line Items]      
Amounts Repurchased 284.2    
Amounts Paid 284.2    
Unamortized Debt Issuance Costs 2.9    
Gain Realized (2.9)    
2029 Notes | Senior Notes      
Debt Instrument [Line Items]      
Amounts Repurchased   8.1 2.8
Amounts Paid   7.8 2.6
Unamortized Debt Issuance Costs   0.1 0.0
Gain Realized   0.2 0.2
2030 Notes      
Debt Instrument [Line Items]      
Amounts Repurchased 142.5    
Amounts Paid 142.5    
Unamortized Debt Issuance Costs 2.0    
Gain Realized (2.0)    
2030 Notes | Senior Notes      
Debt Instrument [Line Items]      
Amounts Repurchased   132.8 11.5
Amounts Paid   130.5 10.7
Unamortized Debt Issuance Costs   2.0 0.2
Gain Realized   0.3 0.6
2031 Notes      
Debt Instrument [Line Items]      
Amounts Repurchased 285.7    
Amounts Paid 277.7    
Unamortized Debt Issuance Costs 3.0    
Gain Realized $ 5.0    
2031 Notes | Senior Notes      
Debt Instrument [Line Items]      
Amounts Repurchased   39.2 47.1
Amounts Paid   34.6 39.4
Unamortized Debt Issuance Costs   0.4 0.6
Gain Realized   $ 4.2 $ 7.1