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, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Fair value $ 1,094.1 $ 59.5
Weighted-average useful life 12 years 7 months 6 days 11 years 8 months 12 days
Proprietary database    
Business Acquisition [Line Items]    
Fair value $ 562.3 $ 48.2
Weighted-average useful life 14 years 6 months 12 years 3 months 18 days
Purchased data files    
Business Acquisition [Line Items]    
Fair value $ 207.0 $ 0.0
Weighted-average useful life 15 years 0 years
Customer relationships    
Business Acquisition [Line Items]    
Fair value $ 160.7 $ 10.6
Weighted-average useful life 10 years 10 years
Acquired software and technology    
Business Acquisition [Line Items]    
Fair value $ 146.3 $ 0.3
Weighted-average useful life 6 years 3 years
Trade names and other intangible assets    
Business Acquisition [Line Items]    
Fair value $ 11.3 $ 0.3
Weighted-average useful life 2 years 2 years
Non-compete agreements    
Business Acquisition [Line Items]    
Fair value $ 6.5 $ 0.1
Weighted-average useful life 4 years 6 months 5 years