v3.26.1
Derivative Financial Instruments and Hedging (Gain) Loss recognized in Statement of Operations from derivative instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Commodity and energy contracts        
Derivative Instruments, (Gain) Loss        
(Gain) Loss Recognized in Statement of Operations $ 2.5 $ 1.3 $ (10.9) $ 5.9
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of goods sold Cost of goods sold Cost of goods sold Cost of goods sold
Foreign Exchange Contract - Forward Contracts        
Derivative Instruments, (Gain) Loss        
(Gain) Loss Recognized in Statement of Operations $ 0.1 $ 1.2 $ 0.5 $ (0.2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, general and administrative expenses Selling, general and administrative expenses Selling, general and administrative expenses Selling, general and administrative expenses
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaps        
Derivative Instruments, (Gain) Loss        
(Gain) Loss Recognized in Statement of Operations $ (3.3) $ 2.6 $ (6.9) $ (7.3)