v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Fair value in the Statement of Financial Position (Details) - Senior Notes - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Jun. 16, 2025
Nov. 30, 2019
0.08 Senior Notes due July 2030        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 8.00% 8.00% 8.00%  
Debt fair value amount $ 650.0 $ 650.0    
0.08 Senior Notes due July 2030 | Quoted Prices in Active Market (Level One)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount 0.0 0.0    
0.08 Senior Notes due July 2030 | Significant Other Observable Inputs (Level Two)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount 684.2 680.1    
0.08 Senior Notes due July 2030 | Significant Unobservable Inputs (Level Three)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount $ 0.0 $ 0.0    
6.75% Senior Notes due December 2027        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Stated interest rate 6.75% 6.75% 6.75% 6.75%
Debt fair value amount   $ 150.0    
6.75% Senior Notes due December 2027 | Quoted Prices in Active Market (Level One)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount   0.0    
6.75% Senior Notes due December 2027 | Significant Other Observable Inputs (Level Two)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount   150.1    
6.75% Senior Notes due December 2027 | Significant Unobservable Inputs (Level Three)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt fair value amount   $ 0.0