DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values of the Company's Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Total derivatives instruments	$ (10.7)	$ 11.0
Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total derivatives instruments	(11.6)	9.9
Designated as Hedging Instruments \| Interest rate swap agreements \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	0.0	2.0
Designated as Hedging Instruments \| Interest rate swap agreements \| Other assets
Derivatives, Fair Value [Line Items]
Derivative asset	0.0	1.8
Designated as Hedging Instruments \| Interest rate swap agreements \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(5.5)	0.0
Designated as Hedging Instruments \| Interest rate swap agreements \| Other liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(5.3)	0.0
Designated as Hedging Instruments \| Commodity hedging instruments \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	0.0	6.1
Designated as Hedging Instruments \| Commodity hedging instruments \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(0.8)	0.0
Derivatives not designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total derivatives instruments	0.9	1.1
Derivatives not designated as Hedging Instruments \| Commodity hedging instruments \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	0.0	1.7
Derivatives not designated as Hedging Instruments \| Commodity hedging instruments \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(0.4)	0.0
Derivatives not designated as Hedging Instruments \| Currency forward contracts \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset	1.7	0.9
Derivatives not designated as Hedging Instruments \| Currency forward contracts \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	$ (0.4)	$ (1.5)

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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