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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