STOCK-BASED COMPENSATION (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Information related to share based awards
Total stock-based compensation expense	$ 1.5	$ 2.7	$ 3.4	$ 4.0
Deferred Income tax benefit	0.6	1.1	1.4	1.6
Stock-based compensation cost capitalized	0	0	0	0
Stock options
Information related to share based awards
Total stock-based compensation expense	0.2	0.3	0.3	0.4
Performance stock rights
Information related to share based awards
Total stock-based compensation expense	0.5	1.2	1.3	1.7
Restricted share units
Information related to share based awards
Total stock-based compensation expense	$ 0.8	$ 1.2	$ 1.8	$ 1.9