POSTRETIREMENT BENEFIT PLANS Postretirement Textuals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan, Plan Assets, Administration Expense	$ 0.9	$ 0.8	$ 1.8	$ 1.6
Defined Benefit Plan, Plan Assets, Contributions by Employer				6.4
Reclassification of Postretirement Costs from AOCI, Net of Tax	1.1	$ 1.2	2.2	$ 2.3
Minimum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	7.0		7.0
Maximum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 11.0		$ 11.0