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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 |  |  |

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