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ACQUISITIONS - Valtech Cardio, Ltd. (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 23, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of shares issued in connection with business combinations (Note 7) |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 266.5 | $ 0.0 |
Research and development expenses |  |  |  | 622.2 | $ 552.6 | $ 442.2 |
Valtech |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price subject to certain adjustments | $ 340.0 |  |  |  |  |  |
Potential milestone-driven payments | $ 350.0 |  |  |  |  |  |
Period to make additional pre-specified milestone-driven payments | 10 years |  |  |  |  |  |
Issuance of shares of common stock (in shares) | 2.8 |  |  |  |  |  |
Fair value of shares issued in connection with business combinations (Note 7) | $ 266.5 |  |  |  |  |  |
Cash paid to acquire business | 86.2 |  |  |  |  |  |
Liability for estimated fair value of contingent milestone payment | 162.9 |  |  |  |  |  |
Additional research and development expenditures to be incurred prior to product introduction | 87.3 |  |  |  |  |  |
Valtech spin off |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Future option to acquire business, amount | 200.0 |  |  |  |  |  |
Future option to acquire business, additional amount subject to regulatory approval | $ 50.0 |  |  |  |  |  |
Future option to acquire business, period to obtain regulatory approval | 10 years |  |  |  |  |  |
Term of exclusive option | 2 years |  |  |  |  |  |
Future option to acquire business, term, maximum extension | 1 year |  |  |  |  |  |
Developed Technology and In-process Research and Development |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  | 116.2 |  |  |
Developed Technology and In-process Research and Development | Valtech |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  | $ 116.2 | $ 116.2 | $ 116.2 |  |  |
Scenario, Forecast | Valtech |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  | $ 113.6

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