POSTRETIREMENT BENEFIT PLANS Postretirement Textuals (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan, Plan Assets, Administration Expense		$ 0.7		$ 2.3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ 1.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment				3.7
Defined Benefit Plan, Plan Assets, Contributions by Employer			9.7	14.3
Defined Benefit Plan, Employer Discretionary Contribution Amount				5.0
Reclassification of Postretirement Costs from AOCI, Net of Tax	$ 2.1	$ 3.6	4.3	$ 5.9
Minimum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	4.0		4.0
Maximum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 6.0		$ 6.0