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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2019 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) reporting_unit Segment Customer | Dec. 31, 2020 USD ($) Customer | Dec. 31, 2019 USD ($) Customer | Feb. 04, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Provision for doubtful accounts |  |  |  | $ (1,100,000) | $ 3,600,000 | $ 2,100,000 |
Inventory, capitalized expenses |  |  |  | 0 | 0 |  |
Depreciation expense |  |  |  | 39,400,000 | 42,100,000 | 42,600,000 |
Write off of construction in progress |  | $ 6,700,000 |  |  |  |  |
Interest expense capitalized into property, plant, and equipment |  |  |  | $ 1,200,000 | 2,300,000 |  |
Number of reportable segments | Segment |  |  |  | 2 |  |  |
Number of reporting units | reporting_unit |  |  |  | 3 |  |  |
Contributions to Integra Foundation |  |  |  | $ 1,200,000 | 800,000 | 300,000 |
Foreign currency transaction gain (loss) |  |  |  | 100,000 | (1,600,000) | (300,000) |
Restructuring reserve, current |  |  |  | 10,200,000 |  |  |
Restructuring costs |  | 6,400,000 |  |  | 6,400,000 |  |
Defer payment and taxation, base salary, percentage (up to) | 75.00% |  |  |  |  |  |
Defer payment and taxation, bonus and other eligible cash compensation, percentage (up to) | 100.00% |  |  |  |  |  |
Interest paid |  |  |  | 43,200,000 | 47,300,000 | 48,900,000 |
Interest paid, capitalized into construction in progress |  |  |  | 1,200,000 | 2,300,000 | 3,100,000 |
Income taxes paid |  |  |  | 49,500,000 | 29,800,000 | 16,200,000 |
Property and equipment purchases included in liabilities |  |  |  | 4,700,000 | 1,600,000 | 11,000,000 |
In-process research and development |  |  |  | 0 | 0 | 64,916,000 |
Intangible assets, net |  | 989,436,000 |  | 1,145,573,000 | 989,436,000 |  |
Cost of goods sold |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | 3,400,000 | 4,900,000 |  |
Selling, general and administrative |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | 500,000 | 1,200,000 |  |
Research and development |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred |  |  |  | 300,000 | 300,000 |  |
2025 Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Convertible debt |  |  |  |  |  |  | $ 575,000,000
Convertible Debt | 2025 Notes |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  |  | 0.50%
Rebound |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Development milestone payment, to be paid |  | 20,000,000 | $ 5,000,000.0 | $ 5,000,000 | 20,000,000 | 5,000,000.0 |
In-process research and development |  |  | $ 5,000,000.0 |  |  | $ 5,000,000 |
Intangible assets, net |  | 20,000,000 |  |  | $ 20,000,000 |  |
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, threshold percentage |  |  |  | 10.00% | 10.00% | 10.00% |
Concentration risk, number of customers over benchmark | Customer |  |  |  | 0 | 0 | 0 |
Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Manufacturing period for products shipped with no alternative use and right of payment for performance |  |  |  | 1 month |  |  |
Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Manufacturing period for products shipped with no alternative use and right of payment for performance |  |  |  | 3 months |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Smith & Nephew USD Limited |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventories |  | 52,800,000 |  |  | $ 52,800,000 |  |
Property, plant and equipment, net |  | $ 37,900,000 |  |  | $ 37,900,000 |  |

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