v3.20.4
Derivative Financial Instruments and Hedging (Gain) Loss recognized in Statement of Operations from derivative instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in OCI including NCI $ 0.0 $ 33.3
Mark-to-Market (Gain), net (a)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (44.3) (80.5)
Cash Settlements Paid, Net (b)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 2.7 19.1
Net Loss Reclassified from Accumulated OCI including NCI (c)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 0.5 7.2
Interest expense, net | Mark-to-Market (Gain), net (a)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (1.2) 0.0
Interest expense, net | Cash Settlements Paid, Net (b)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 1.2 0.0
Interest expense, net | Net Loss Reclassified from Accumulated OCI including NCI (c)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 0.5 7.2
Income on swaps, net | Mark-to-Market (Gain), net (a)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (43.1) (80.5)
Income on swaps, net | Cash Settlements Paid, Net (b)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 1.5 19.1
Income on swaps, net | Net Loss Reclassified from Accumulated OCI including NCI (c)    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 0.0 0.0
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Cost of Goods Sold    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (7.4) (1.9)
Derivatives Not Designated as Hedging Instruments | Energy Contracts | Cost of Goods Sold    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (8.0) (2.5)
Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract - Forward Contracts | Selling, General and Administrative Expenses    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 1.5 0.0
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Interest expense, net    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations 0.5 0.0
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Income on swaps, net    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in Statement of Operations (41.6) (61.4)
Hedging Instruments | Interest rate swaps    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in OCI including NCI 0.0 (1.3)
Hedging Instruments | Interest rate swaps | Interest expense, net    
Derivative Instruments, (Gain) Loss    
Loss Reclassified from Accumulated OCI including NCI into Earnings (a) 0.5 7.2
Hedging Instruments | Currency Swap    
Derivative Instruments, (Gain) Loss    
(Gain) Loss Recognized in OCI including NCI 0.0 34.6
Hedging Instruments | Currency Swap | Income on swaps, net    
Derivative Instruments, (Gain) Loss    
Loss Reclassified from Accumulated OCI including NCI into Earnings (a) $ 0.0 $ 0.0