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, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Fair value $ 92.0 $ 50.9
Weighted-average useful life 7 years 3 months 18 days 9 years 9 months 18 days
Customer relationships    
Business Acquisition [Line Items]    
Fair value $ 17.1 $ 16.5
Weighted-average useful life 9 years 10 months 24 days 9 years
Acquired software and technology    
Business Acquisition [Line Items]    
Fair value   $ 2.7
Weighted-average useful life   2 years 8 months 12 days
Purchased data files    
Business Acquisition [Line Items]    
Fair value $ 68.6 $ 30.2
Weighted-average useful life 6 years 10 months 24 days 11 years 3 months 18 days
Non-compete agreements    
Business Acquisition [Line Items]    
Fair value $ 4.0 $ 0.8
Weighted-average useful life 5 years 2 years 7 months 6 days
Trade names and other intangible assets    
Business Acquisition [Line Items]    
Fair value $ 2.3 $ 0.7
Weighted-average useful life 4 years 6 months 1 year 10 months 24 days