EMPLOYEE BENEFITS (Fair value of plan assets valued at NAV) (Details) $ in Millions	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	$ 93.4
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	34.1
Equities
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	54.3
Other
Defined Benefit Plan Disclosure [Line Items]
Amount of defined benefit pension plan assets	$ 5.0