DISPOSITIONS AND SPECIAL GAINS AND CHARGES - Special Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
2019 Business Disposals
Restructuring Reserve [Roll Forward]
Balance beginning of period	$ 2.8
Charged to expense	0.7
Paid or otherwise settled	(0.7)
Balance end of period	2.8	$ 2.8
2018 Business Disposals
Restructuring Reserve [Roll Forward]
Balance beginning of period	$ 7.1	20.2
Charged to expense		2.5
Paid or otherwise settled		(15.6)
Balance end of period		$ 7.1