ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 0.5	$ 2.5			$ 1.3	$ 4.1
Pension settlement charges	1.3	9.8			2.8	10.4
Total before tax	(14.2)	(23.5)			(5.4)	(76.9)
Tax expense	7.2	6.0			(2.9)	19.8
Net earnings	(7.0)	(17.5)	$ (21.7)	$ (18.0)	(8.3)	(57.1)
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	(0.1)			(0.2)	(0.5)
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)	(0.1)			(1.0)	(0.4)
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	1.3	9.8			2.8	10.4
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	1.7	9.8			3.6	10.3
Tax expense	(0.4)	(2.7)			(0.9)	(2.7)
Net earnings	$ 1.3	$ 7.1			$ 2.7	$ 7.6