PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Additional) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Contribution, Percentage, Maximum			7.00%
Defined Contribution Plan, Cost	$ 4.6	$ 4.5	$ 14.2	$ 14.8
Defined Contribution Plan, Employer Discretionary Contribution Amount			16.4
Defined Contribution Plan, Expected Future Employer Contributions, Remainder of Fiscal Year			$ 19.0