RESTRUCTURING CHARGES - Additional Information (Details) - USD ($)	3 Months Ended	5 Months Ended	9 Months Ended	28 Months Ended	49 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 7,700,000
Restructuring and related charges	12,100,000
2018 Optimization Restructuring Program
Restructuring Cost and Reserve [Line Items]
Additional capital expenditures, expected cost	$ 10,000,000	$ 10,000,000		$ 10,000,000
Percent of restructuring charges expected to be paid in cash	85.00%	85.00%		85.00%
Payments for restructuring	$ 3,000,000	$ 3,800,000
Restructuring costs recognized to date	17,400,000	17,400,000		$ 17,400,000		$ 5,700,000
Restructuring and related charges	11,700,000
2018 Optimization Restructuring Program | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	30,000,000	30,000,000		30,000,000
2018 Optimization Restructuring Program | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	40,000,000	40,000,000		40,000,000
2018 Optimization Restructuring Program | Employee-related costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	1,800,000
Restructuring costs recognized to date	9,600,000	9,600,000		9,600,000		4,500,000
Restructuring and related charges	5,100,000
2018 Optimization Restructuring Program | Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs recognized to date	0	0		0		$ 0
Restructuring and related charges	0
EA Integration Restructuring Program
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	3,100,000			67,000,000
Restructuring costs recognized to date	82,200,000	82,200,000		82,200,000
Restructuring and related charges	0
EA Integration Restructuring Program | Employee-related costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	3,000,000
Restructuring costs recognized to date	72,200,000	72,200,000		72,200,000
Restructuring and related charges	0
EA Integration Restructuring Program | Lease termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs recognized to date	5,100,000	5,100,000		5,100,000
EA Integration Restructuring Program | Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs recognized to date	$ 4,900,000	$ 4,900,000		$ 4,900,000
Scenario, Forecast | 2018 Optimization Restructuring Program | Minimum
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 22,000,000
Scenario, Forecast | 2018 Optimization Restructuring Program | Maximum
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 30,000,000
Scenario, Forecast | EA Integration Restructuring Program | Minimum
Restructuring Cost and Reserve [Line Items]
Payments for restructuring					$ 80,000,000
Scenario, Forecast | EA Integration Restructuring Program | Maximum
Restructuring Cost and Reserve [Line Items]
Payments for restructuring					$ 85,000,000