EARNINGS PER COMMON SHARE (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
EARNINGS PER COMMON SHARE [Abstract]
Anti-dilutive stock options excluded from calculation of dilutive earnings per share									1,400,000	600,000	3,400,000
Earnings per share is calculated as follows:
Net income attributable to common shareholders	$ 39.2	$ 23.4	$ 25.3	$ 32.9	$ 63.5	$ 1.5	$ 33.1	$ 35.2	$ 120.8	$ 133.3	$ 125.3
Average shares outstanding - Basic									62,120,000	63,164,000	62,934,000
Add potential effect of exercise of stock options and other unvested equity awards									241,000	735,000	805,000
Average shares outstanding - Diluted									62,361,000	63,899,000	63,739,000
Net income attributable to common shareholders per common share - Basic	$ 0.63	$ 0.38	$ 0.41	$ 0.53	$ 1.01	$ 0.02	$ 0.53	$ 0.56	$ 1.94	$ 2.11	$ 1.99
Net income attributable to common shareholders per common share - Diluted	$ 0.63	$ 0.37	$ 0.4	$ 0.53	$ 1.01	$ 0.02	$ 0.52	$ 0.55	$ 1.94	$ 2.09	$ 1.97