BORROWINGS - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 49.4	$ 49.4	[1]
Short-term borrowings	64.7	329.6	[1]
Debt issuance costs	(0.6)	(0.6)
Total short-term debt	114.1	379.0
Debt issuance costs	(0.1)	(0.6)
Long-term debt	$ 249.9	$ 286.9	[1]
2013 Term Loan Facility
Debt Instrument [Line Items]
Weighted-Average Interest Rate (as a percent)	2.23%	1.65%
Long-term debt	$ 250.0	$ 287.5
2013 Term Loan Facility
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 50.0	$ 50.0
Weighted-Average Interest Rate (as a percent)	2.23%	1.65%
2013 Revolving Credit Facility
Debt Instrument [Line Items]
Weighted-Average Interest Rate (as a percent)	2.47%	1.91%
Short-term borrowings	$ 38.0	$ 300.0
Sumitomo Credit Facility
Debt Instrument [Line Items]
Weighted-Average Interest Rate (as a percent)	0.53%	0.53%
Short-term borrowings	$ 26.7	$ 29.6

[1] The condensed consolidated balance sheet as of September 30, 2016 was derived from audited financial statements as of that date, but does not include all disclosures required by accounting principles generally accepted in the United States of America.