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RESTRUCTURING CHARGES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Selling, general and administrative expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 11.5 | $ 46.1 |  |
Restructuring charges, net of tax | $ 8.8 | $ 35.0 |  |
Restructuring Charges Incurred In 2018 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payments for restructuring |  |  | $ 26.0 | $ 11.5
Restructuring Charges Incurred in 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payments for restructuring |  |  | $ 10.0 |

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