SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Segment Reporting Information [Line Items]
Property, plant and equipment, gross		$ 55.3	$ 58.2	$ 55.3
Goodwill and Intangible Assets
Operating lease right-of-use assets			59.3
Advertising Costs
Advertising expense			69.8	70.4	$ 67.0
Vendor consideration			2.2	(3.3)	(5.8)
Stock Based Compensation
Number of options repriced (shares)	600
Net Income (Loss) Per Common Share
Income (loss) from continuing operations available to common stockholders, basic			50.0	49.8	65.5
Income (loss) from continuing operations available to common stockholders, diluted			49.7	49.5	65.5
Income (loss) from discontinued operations available to common stockholders, basic			(1.5)	174.4	(25.1)
Income (loss) from discontinued operations available to common stockholders, diluted			$ (1.5)	175.2	$ (25.1)
Stock options and restricted stock awards securities excluded from computation of earnings (loss) per share (in shares)			400		40
Employee Benefit Plans
Minimum annual contribution per employee			1.00%
Aggregate expense in contribution plans			$ 1.1	$ 1.2	$ 0.7
Fair Value Measurements
Weighted average interest rate on short-term borrowings		5.70%	6.20%	5.70%	4.70%
IPG
Goodwill and Intangible Assets
Intangible asset impairment charges		$ 1.9
ETG
Advertising Costs
Vendor consideration			$ 0.0	$ 2.0	$ 4.7
NATG
Advertising Costs
Advertising expense			$ 0.0	1.1	$ 2.5
Minimum
Advertising Costs
Amortization period			1 month
Maximum
Advertising Costs
Amortization period			4 months
Leasehold Improvements
Segment Reporting Information [Line Items]
Property, plant and equipment, gross		$ 11.7	$ 13.1	$ 11.7
Furniture, Fixtures and Equipment | Minimum
Segment Reporting Information [Line Items]
Estimated useful lives			3 years
Furniture, Fixtures and Equipment | Maximum
Segment Reporting Information [Line Items]
Estimated useful lives			15 years
Internal-Use Software
Segment Reporting Information [Line Items]
Estimated useful lives			3 years
Employee Stock Option
Stock Based Compensation
Compensation Expense	$ 0.6		$ 0.7
Net Income (Loss) Per Common Share
Shares included in the calculated of diluted earnings per share			200	500	400
Employee Stock Option | ETG
Stock Based Compensation
Additional compensation costs				$ 0.3
Restricted Stock
Net Income (Loss) Per Common Share
Shares included in the calculated of diluted earnings per share			0	200	200
Accounting Standards Update 2016-02
Goodwill and Intangible Assets
Definite-lived intangible assets transferred to right-of-use assets						$ (0.3)
Operating lease right-of-use assets						$ 54.0
Accounting Standards Update 2017-09
Stock Based Compensation
Number of options repriced (shares)	600
Accounting Standards Update 2017-09 | Employee Stock Option
Stock Based Compensation
Compensation Expense	$ 0.6		$ 0.7
Restatement Adjustment | Leasehold Improvements
Segment Reporting Information [Line Items]
Property, plant and equipment, gross			(4.2)
Restatement Adjustment | Machinery and Equipment
Segment Reporting Information [Line Items]
Property, plant and equipment, gross			$ 4.2