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QUARTERLY FINANCIAL RESTULTS AND MARKET FOR THE COMPANY'S STOCK (UNAUDITED) - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on litigation settlement |  |  | $ 367.9 |  |  |  |  |  |
Inventory write off |  |  |  | $ 26.9 | $ 46.2 | $ 0.0 | $ 73.1 | $ 0.0 |
Early-stage Transcatheter Intellectual Property |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Acquisition transaction costs |  |  |  |  |  |  |  |  | $ 24.0
Developed technology | Valtech |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  | $ 40.6 |  |  |  |  |  |  |
Rest of World | Developed technology | Valtech |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets | $ 40.6 |  |  |  |  |  |  |  |

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