EMPLOYEE BENEFITS (Fair value of plan assets valued at NAV) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	$ 97.2
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	36.3
Equities
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	55.9
Other
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	$ 5.0