INFORMATION BY OPERATING SEGMENT - Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting [Abstract]
Net Income	$ 46.9	$ 47.1
Unrealized gain on energy-related derivative contracts	(3.0)	(3.0)
Lower of cost or market inventory adjustments	0.3	1.2
Acquisition, divestiture and restructuring activities	0.9	0.4
Net Economic Earnings (Non-GAAP)	$ 45.1	$ 45.7