ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 0.6	$ 1.2
Pension settlement charges	1.6	0.7
Total before tax	1.7	(7.0)
Tax expense	0.2	(3.9)
Net earnings (loss)	1.9	(10.9)
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	(0.1)	0.0
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	(0.4)	(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	1.6	0.7
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	1.9	1.0
Tax expense	(0.4)	(0.2)
Net earnings (loss)	$ 1.5	$ 0.8