EMPLOYEE RETIREMENT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation expense	$ 2.1	$ 1.8	$ 1.7
Savings and Investment Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation expense	11.3	13.3	11.3
Hourly Tax-Sheltered Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Compensation expense	$ 0.4	$ 0.4	$ 0.3
First 3% of employee contributions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching percentage of employee contributions	100.00%
The next 2% of employee contributions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching percentage of employee contributions	50.00%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution savings and investment plan, employees contribution rate	100.00%