POSTRETIREMENT BENEFIT PLANS Postretirement Textuals (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ (2.9)	$ (2.2)
Reclassification of Postretirement Costs from AOCI, Net of Tax	0.0	$ 0.9
US. Qualified Pension Plan Termination [Member]
Defined Benefit Plan, Plan Assets, Payment for Settlement			$ 320.0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			$ 8.4
Minimum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	10.0
Maximum [Member]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 14.0