Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND INVESTMENTS - Acquired Intangible Assets Fair Value and Weighted-Average Useful Life (Details)

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ACQUISITIONS AND INVESTMENTS - Acquired Intangible Assets Fair Value and Weighted-Average Useful Life (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Fair value $ 59.5 $ 92.0
Weighted-average useful life 11 years 8 months 12 days 7 years 3 months 18 days
Customer relationships    
Business Acquisition [Line Items]    
Fair value $ 10.6 $ 17.1
Weighted-average useful life 10 years 9 years 10 months 24 days
Acquired software and technology    
Business Acquisition [Line Items]    
Fair value $ 0.3 $ 0.0
Weighted-average useful life 3 years 0 years
Proprietary database    
Business Acquisition [Line Items]    
Fair value $ 48.2 $ 68.6
Weighted-average useful life 12 years 3 months 18 days 6 years 10 months 24 days
Non-compete agreements    
Business Acquisition [Line Items]    
Fair value $ 0.1 $ 4.0
Weighted-average useful life 5 years 5 years
Trade names and other intangible assets    
Business Acquisition [Line Items]    
Fair value $ 0.3 $ 2.3
Weighted-average useful life 2 years 4 years 6 months