SHARE-BASED COMPENSATION - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended				1 Months Ended		9 Months Ended	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Restricted Stock	Sep. 30, 2014 Phantom Stock [Member]	Feb. 28, 2014 Performance Based Units	Jan. 31, 2014 Performance Based Units	Sep. 30, 2014 Performance Based Units	May 31, 2014 Outside directors	May 31, 2013 Outside directors	Sep. 30, 2014 Stock Option	Sep. 30, 2013 Stock Option	Sep. 30, 2014 Stock Option	Sep. 30, 2013 Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share												1,300,000	1,600,000	1,400,000	1,700,000
Share-based compensation expense recognized	$ 0.1	$ 3.0	$ 7.1	$ 11.2						$ 1.6	$ 1.8
Income tax benefit recognized related to share-based awards	0.1	1.1	2.3	4.1
Compensation expense expected to be recognized					11.0				0.9
Compensation expense expected to be recognized, weighted average remaining vesting period					1 year 1 month				1 year 2 months
Shares outstanding (shares)						0
Shares of common stock issued										197,865
Performance units issued							100,000	500,000
Award requisite service period			2 years
Fair value of outstanding performance units issued	$ 1.4		$ 1.4