INFORMATION BY OPERATING SEGMENT - Reconciliation of Consolidated Net Income to Consolidated Net Economic Earnings (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting [Abstract]
Net Income	$ 47.1	$ 35.6
Unrealized loss (gain) on energy-related derivatives	(3.0)	0.4
Lower of cost or market inventory adjustments	1.2	(0.1)
Acquisition, divestiture and restructuring activities	0.4	0.4
Net Economic Earnings (Non-GAAP)	$ 45.7	$ 36.3