ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 1.0		$ 2.8		$ 1.6	$ 6.8
Pension settlement charge	0.5		4.6		0.6	4.6
Income before income tax expense	28.9		17.7		53.4	38.7
Income tax expense	7.2		4.6		13.8	10.3
Net earnings	21.7	$ 18.0	13.1	$ 15.3	39.6	28.4
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(0.2)		(0.2)		(0.4)	(0.4)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(0.2)		(0.3)		(0.3)	(0.7)
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 charge	0.5		4.6		0.6	4.6
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Post-Employment Liability Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income tax expense	(0.5)		(4.7)		(0.5)	(4.9)
Income tax expense	(0.2)		(1.3)		0.0	(1.3)
Net earnings	$ (0.3)		$ (3.4)		$ (0.5)	$ (3.6)