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RESTATEMENT OF PREVIOUSLY ISSUED CONSOLIDATED FINANCIAL STATEMENTS, Description of Restatement Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2018		Dec. 31, 2017	Sep. 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]		(1,424,376)
Restatement Adjustment [Member] [Member]
Description of Restatement Adjustments [Abstract]
Common stock, shares issued (in shares)						(993,623)
Treasury stock, shares (in shares)						(993,623)
Restatement Adjustment [Member] [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)
Tax expense (benefit) related to pre-tax restatement adjustments	$ (0.1)	$ (0.1)
Income tax expense (benefit) related to correction of tax related misstatements	$ (0.3)	$ (0.2)
[1] As described in Note 2 to these Consolidated Financial Statements, we have restated the Consolidated Financial Statements.

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Amount of income tax expense (benefit), related to pre-tax restatement adjustments.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act for related interest expense.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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