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DISPOSITIONS AND SPECIAL GAINS AND CHARGES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  | $ 0.0 | $ 178.9 | $ 0.0 |
Special (gains) charges, net |  |  | (0.8) | 0.8 | 0.3 |
Disposed of by Sale | French Business Unit |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  |  | 175.8 |  |
Disposed of by Sale | NATG |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ongoing restitution proceedings |  |  |  |  | 0.7 |
Discontinued operations incurred special charges related to updating future lease cash flows |  |  |  |  | 6.9 |
Charges for updating future lease cash flows |  |  |  |  | 6.2 |
Disposed of by Sale | SARL Business Segment |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  |  |  | (23.7) |
Pre-tax book loss on sale |  |  |  |  | 23.7 |
NATG |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Ongoing restitution proceedings |  |  |  | 0.1 |  |
Restitution receipts |  |  |  | 1.0 |  |
Vendor settlements |  |  |  | 0.2 |  |
Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Special (gains) charges, net |  |  | $ 0.0 | 0.6 | 30.6 |
Discontinued Operations | Disposed of by Sale | French Business Unit |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  |  | 178.9 |  |
Discontinued Operations | NATG |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Special (gains) charges, net |  |  |  | 1.7 |  |
Continuing Operations | NATG |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Special (gains) charges, net |  |  |  | $ 0.8 | $ 0.3 |
Accounting Standards Update 2016-02 | NATG and Corporate |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Exit liability reclassified to right-of-use asset |  |  |  |  |  | $ 4.3
Scenario, Forecast | Discontinued Operations | NATG |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Special (gains) charges, net |  | $ 1.0 |  |  |  |
Germany | Continuing Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Special (gains) charges, net | $ (0.8) |  |  |  |  |

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