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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Change in fair value of contingent consideration liabilities, net | $ (13.6) | $ 6.1 | $ 5.7
Measurement Input, Discount Rate | Minimum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.0008 |  |
Measurement Input, Discount Rate | Maximum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.0853 |  |
Measurement Input, Discount Rate | Weighted Average | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.031 |  |
Measurement Input, Probability of Milestone Achievement | Minimum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.004 |  |
Measurement Input, Probability of Milestone Achievement | Maximum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.997 |  |
Measurement Input, Probability of Milestone Achievement | Weighted Average | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.707 |  |
Measurement Input, Volatility of Future Revenue | Minimum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.370 |  |
Measurement Input, Volatility of Future Revenue | Maximum | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.400 |  |
Measurement Input, Volatility of Future Revenue | Weighted Average | Level 3 | Obligations |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Contingent consideration liability measurement input | 0.388 |  |
Two Previous Acquisitions |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Change in fair value of contingent consideration liabilities, net | $ 12.7 | $ 24.1 |

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