RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		51 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	$ 2.6		$ 6.2		$ 2.6	$ 6.2	$ 2.6	$ 3.1	$ 8.2
Restructuring charges	1.7	$ 1.7	3.8	$ 4.0	3.4	7.8	243.7
Amounts utilized					(3.9)	(9.8)
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0.0		0.0		0.0	0.0	0.0	0.0	1.5
Restructuring charges	0.0	0.1	0.4	1.4			9.4
Amounts utilized					(0.1)	(3.3)
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	2.6		5.3		2.6	5.3	2.6	3.1	6.0
Restructuring charges	0.0	0.1	0.2	0.1			41.4
Amounts utilized					(0.6)	(1.0)
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges							1.7
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0.0		0.9		0.0	0.9	0.0	$ 0.0	$ 0.7
Restructuring charges	$ 1.7	$ 1.5	$ 3.2	$ 2.5			51.6
Amounts utilized					$ (3.2)	$ (5.5)
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ 139.6