FAIR VALUE DISCLOSURES - Summary of Assumptions Used in Calculating Fair Value (Details) $ in Millions	Dec. 31, 2019 USD ($) year	Dec. 31, 2018 USD ($) year
Monte Carlo Simulation | Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input		0.1075
Monte Carlo Simulation | Minimum | Expected payment period remaining (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input | year		1
Monte Carlo Simulation | Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input		0.1225
Monte Carlo Simulation | Maximum | Expected payment period remaining (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input | year		3
Income Approach | Expected payment period remaining (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input | year		1
Income Approach | Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input		0.0370
Income Approach | Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input		0.0500
Discounted Cash Flow | Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input	0.0370	0.0603
Discounted Cash Flow | Minimum | Expected payment period remaining (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input | year	0	1
Discounted Cash Flow | Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input	0.0746	0.1575
Discounted Cash Flow | Maximum | Expected payment period remaining (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration, measurement input | year	3	4
Fair Value, Measurements, Recurring | Monte Carlo Simulation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		$ 33.2
Fair Value, Measurements, Recurring | Monte Carlo Simulation | Payment cap
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Payment cap		37.3
Fair Value, Measurements, Recurring | Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		26.5
Fair Value, Measurements, Recurring | Income Approach | Payment cap
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Payment cap		27.3
Fair Value, Measurements, Recurring | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ 27.2	1.0
Fair Value, Measurements, Recurring | Discounted Cash Flow | Payment cap
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Payment cap	$ 28.8	$ 1.1