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GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) reporting_unit | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Goodwill [Line Items] |  |  |
Number of reporting units | reporting_unit | 3 |  |
Amortization expense | $ 83.3 | $ 74.5 | $ 72.8
Expected annual amortization expense, 2022 | 79.1 |  |
Expected annual amortization expense, 2023 | 78.4 |  |
Expected annual amortization expense, 2024 | 77.7 |  |
Expected annual amortization expense, 2025 | 77.7 |  |
Expected annual amortization expense, 2026 | 77.6 |  |
Expected annual amortization expense, thereafter | 585.8 |  |
Amortization of product technology | $ 66.5 | 46.7 | $ 45.8
Smith & Nephew USD Limited | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Goodwill [Line Items] |  |  |
Intangible assets, net |  | $ 13.3 |

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