RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2018		Dec. 31, 2017	Jun. 30, 2019
Description of Restatement Adjustments [Abstract]
Common stock, shares issued (in shares)			(10,353,155)	[1]		(10,354,563)
Treasury stock, shares (in shares)			(1,292,594)	[1]		(1,422,339)
Restatement Adjustment [Member]
Description of Restatement Adjustments [Abstract]
Common stock, shares issued (in shares)						(993,623)
Treasury stock, shares (in shares)						(993,623)
Restatement Adjustment [Member] | Restatement Income Taxes [Member]
Description of Restatement Adjustments [Abstract]
Increase (decrease) to income tax expense			$ 0.6		$ (0.2)
Increase (decrease) to income tax expense for correction			(0.5)		1.3
Increase (decrease) to income tax expense for correction of smaller adjustments			(0.4)		(0.9)
Increase (decrease) to income tax expense for correction of income earned from wholly-owned foreign subsidiaries			$ (0.1)		(0.2)
Interest expense related to other corrections					$ (0.2)
Income tax expense (benefit) related to correction of tax related misstatements		$ 0.1
Restatement Adjustment [Member] | Restatement Income Taxes [Member] | Maximum [Member]
Description of Restatement Adjustments [Abstract]
Tax expense (benefit) related to pre-tax restatement adjustments	$ (0.1)	$ (0.1)
Income tax expense (benefit) related to correction of tax related misstatements	$ 0.1

[1] As described in Note 2 to these Consolidated Financial Statements, we have restated the Consolidated Financial Statements.