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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Jan. 05, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Deferred payments and contingent consideration related to business combinations |  |  | $ 130.9 | $ 16.7 |
Goodwill |  |  | 304.7 |  | $ 240.6
Chindex |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total purchase consideration |  | $ 66.0 |  |  |
Cash payments |  | 1.3 |  |  |
Deferred payments and contingent consideration related to business combinations |  | 64.7 |  |  |
Estimated total undiscounted contingent consideration |  | 81.0 |  |  |
Change in undiscounted contingent liability |  |  | (6.0) |  |
Payment of contingent liability |  |  | 8.5 |  |
Net additional expense |  |  | $ 4.1 |  |
Net tangible assets acquired |  | 1.7 |  |  |
Intangible assets acquired |  | 58.6 |  |  |
Goodwill |  | $ 5.7 |  |  |
Weighted average useful life |  | 2 years 10 months 24 days |  |  |
Chindex | Distribution rights |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  | $ 48.2 |  |  |
Chindex | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired |  | $ 10.4 |  |  |
Schölly |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total purchase consideration | $ 100.6 |  |  |  |
Cash payments | 34.4 |  |  |  |
Net tangible assets acquired | 10.8 |  |  |  |
Intangible assets acquired | 30.5 |  |  |  |
Goodwill | $ 59.3 |  |  |  |
Weighted average useful life | 6 years 7 months 6 days |  |  |  |
Deferred cash payments | $ 66.2 |  |  |  |
Inventory | 6.1 |  |  |  |
Cash | $ 1.5 |  |  |  |

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