PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Balance Sheet and Accumulated Other Comprehensinve Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Amounts recognized in the consolidated balance sheets consist of:
Other noncurrent assets	$ 0.0	$ 4.2
Other current liabilities	0.0	0.0
Pension Liability	(22.0)	(13.9)
Other noncurrent liabilities	0.0	0.0
Net amount recognized	(22.0)	(9.7)
Amounts recognized in accumulated other comprehensive income (loss) before taxes:
Net actuarial loss	49.2	55.9
Prior service (credit)	0.0	0.0
Net amount recognized	49.2	55.9
Other Benefits
Amounts recognized in the consolidated balance sheets consist of:
Other noncurrent assets	0.0	0.0
Other current liabilities	(0.3)	(0.3)
Pension Liability	0.0	0.0
Other noncurrent liabilities	3.6	3.3
Net amount recognized	(3.9)	(3.6)
Amounts recognized in accumulated other comprehensive income (loss) before taxes:
Net actuarial loss	1.1	1.1
Prior service (credit)	(1.5)	(2.6)
Net amount recognized	$ (0.4)	$ (1.5)