EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
EARNINGS PER COMMON SHARE [Abstract]
Net income attributable to common shareholders									$ 47.7	$ 60.6	$ 105.0
Average shares outstanding - Basic									57,249	57,555	59,910
Add potential effect of exercise of stock options and other unvested equity awards									1,287	968	340
Average shares outstanding - Diluted									58,536	58,523	60,250
Basic net income (loss) attributable to common shareholders per common share	$ (0.16)	$ 0.34	$ 0.46	$ 0.21	$ 0.43	$ 0.46	$ (0.06)	$ 0.23	$ 0.83	$ 1.05	$ 1.75
Diluted net income (loss) attributable to common shareholders per common share	$ (0.16)	$ 0.33	$ 0.45	$ 0.21	$ 0.42	$ 0.45	$ (0.06)	$ 0.22	$ 0.82	$ 1.04	$ 1.74
Shares with anti-dilutive effect excluded from the computation of Diluted EPS									200	300	1,400