ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ (0.3)	$ 1.0		$ 0.9	$ 1.6
Pension settlement charges	0.8	0.5		1.5	0.6
Total before tax	15.8	(28.9)		8.8	(53.4)
Tax expense	(6.2)	7.2		(10.1)	13.8
Net earnings (loss)	9.6	(21.7)	$ (18.0)	(1.3)	(39.6)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Prior Service Credits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(0.2)	(0.2)		(0.2)	(0.4)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Actuarial Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(0.3)	(0.2)		(0.6)	(0.3)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Pension Settlement Charge
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension settlement charges	0.8	0.5		1.5	0.6
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Post-Employment Liability Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.9	0.5		1.9	0.5
Tax expense	(0.2)	(0.2)		(0.4)	0.0
Net earnings (loss)	$ 0.7	$ 0.3		$ 1.5	$ 0.5