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EMPLOYEE RETIREMENT PLANS (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
U.S. pension plans        
Defined Contribution Plan Disclosure [Line Items]        
Expense related to the defined contribution plans $ 3.4 $ 3.2 $ 7.3 $ 7.5