PENSION AND POST-RETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (income) costs	$ 2.2	$ 0.8	$ 6.3	$ 2.0	$ 2.6
Net periodic benefit (income) costs next fiscal year			8.3
Estimated contributions in next fiscal year	12.0		12.0
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (income) costs	2.0	0.6	5.8	1.4
Employer contributions	3.2		7.3
Other Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit (income) costs	0.2	$ 0.2	0.5	$ 0.6
Employer contributions	$ 0.2		$ 0.5