PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Additional) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2020
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Contribution, Percentage, Maximum	7.00%
Defined Contribution Plan, Cost	$ 6.0	$ 5.4
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 11.9
Forecast [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 18.0