INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended
	Oct. 31, 2010	Jan. 31, 2009	Sep. 30, 2011	Sep. 30, 2010
INCOME TAXES
Effective income tax rate (as a percent)			36.70%	36.20%
Tax paid / (refund received) relating to federal income tax returns examination for the year 2003 through 2005	$ (2.3)	$ 3.4
Interest paid / (refund received) relating to federal income tax returns examination for the year 2003 through 2005	(0.6)	1.2
Accrual for uncertain tax positions			9.7
Portion of unrecognized tax benefits, if recognized, would impact entity's effective tax rate			9.6
Accrued interest and penalties related to unrecognized tax benefit			1.4
Decrease in unrecognized tax benefits, is reasonably possible, estimated range, maximum			$ 0.4