ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 1.2	$ 0.7
Pension settlement charges	0.7	0.2
Income before income tax expense	7.0	24.5
Tax expense	(3.9)	6.5
Net earnings	10.9	18.0
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	0.0	(0.2)
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)	(0.1)
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	0.7	0.2
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Post-Employment Liability Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income tax expense	1.0	0.1
Tax expense	0.2	0.0
Net earnings	$ 0.8	$ 0.1