EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Computation of Basic Income per Share [Abstract]
Net income	$ 69.7	$ 28.7	$ 153.9	$ 115.0
Basic shares (in shares)	79.8	80.1	80.1	80.1
Basic net income per share (in dollars per share)	$ 0.87	$ 0.36	$ 1.92	$ 1.44
Computation of Diluted Income per Share [Abstract]
Basic shares (in shares)	79.8	80.1	80.1	80.1
Stock-based compensation (in shares)	1.0	0.9	1.0	0.8
Diluted shares (in shares)	80.8	81.0	81.1	80.9
Diluted net income per share (in dollars per share)	$ 0.86	$ 0.35	$ 1.90	$ 1.42
Antidilutive shares excluded from the computation of earnings per share (in shares)	0.9	1.0	1.4	1.0