ACCUMULATED OTHER COMPREHENSIVE INCOME (Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Prior service cost
Amortization of pension and other postretirement plan items:
Total net periodic benefit cost, before tax	$ 0.4
Recognized actuarial loss
Amortization of pension and other postretirement plan items:
Total net periodic benefit cost, before tax	(16.8)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Amortization of pension and other postretirement plan items:
Total net periodic benefit cost, before tax	(16.4)
Total net periodic benefit cost, tax benefit	4.0
Total net periodic benefit cost, net of tax	$ (12.4)