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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Carrying Values and Fair Values for Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets $ 22.2 $ 6.8
Derivative liabilities 6.0 2.5
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 22.2 6.8
Derivative liabilities 6.0 2.5
Debt 2,815.9 2,628.2
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 22.2 6.8
Derivative liabilities 6.0 2.5
Debt 3,156.8 2,506.3
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0.0 0.0
Derivative liabilities 0.0 0.0
Debt 0.0 0.0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 22.2 6.8
Derivative liabilities 6.0 2.5
Debt 2,815.9 2,628.2
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative assets 0.0 0.0
Derivative liabilities 0.0 0.0
Debt $ 0.0 $ 0.0