v3.24.1.u1
Derivative Financial Instruments and Hedging (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Derivatives, Fair Value      
Financing portion of cash paid for rate-lock interest rate swaps $ 0.0 $ 43.5  
Commodity contracts | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Notional Amount of Derivative 222.0   $ 215.0
Energy Contracts | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Notional Amount of Derivative 39.9   48.9
Foreign Exchange Contract - Forward Contracts | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Notional Amount of Derivative 2.3   3.0
Interest Rate Swap | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Derivative, Notional amount of terminated contracts 400.0 200.0  
Derivative, Cash Received for Termination 5.2 6.7  
Notional Amount of Derivative 300.0   700.0
Interest rate swap, rate lock swaps | Derivatives Not Designated as Hedging Instruments      
Derivatives, Fair Value      
Derivative, Cash Settlements paid, net   43.5  
Derivative, Notional amount of terminated contracts   $ 516.7  
Other Current Assets | Commodity contracts      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 2.2   1.2
Other Current Assets | Energy Contracts      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 0.4   2.5
Other Current Assets | Interest Rate Swap      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 3.6   10.6
Other Assets | Commodity contracts      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 6.0   0.0
Other Assets | Interest Rate Swap      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 1.6   11.3
Assets, Total      
Derivatives, Fair Value      
Derivative Asset, Fair Value, Gross Asset 13.8   25.6
Other Current Liabilities | Commodity contracts      
Derivatives, Fair Value      
Derivative Liability, Fair Value, Gross Liability 10.6   14.1
Other Current Liabilities | Energy Contracts      
Derivatives, Fair Value      
Derivative Liability, Fair Value, Gross Liability 4.5   2.0
Other Liabilities | Interest Rate Swap      
Derivatives, Fair Value      
Derivative Liability, Fair Value, Gross Liability 1.1   0.0
Liabilities, Total      
Derivatives, Fair Value      
Derivative Liability, Fair Value, Gross Liability $ 16.2   $ 16.1