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, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Fair value $ 50.9 $ 51.0
Weighted-average useful life 9 years 10 months 9 years 6 months
Customer relationships    
Business Acquisition [Line Items]    
Fair value $ 16.5 $ 42.7
Weighted-average useful life 9 years 10 years 2 months
Acquired software and technology    
Business Acquisition [Line Items]    
Fair value $ 2.7 $ 6.5
Weighted-average useful life 2 years 8 months 6 years 6 months
Purchased data files    
Business Acquisition [Line Items]    
Fair value $ 30.2 $ 0.0
Weighted-average useful life 11 years 3 months  
Non-compete agreements    
Business Acquisition [Line Items]    
Fair value $ 0.8 0.0
Weighted-average useful life 2 years 7 months  
Trade names and other intangible assets    
Business Acquisition [Line Items]    
Fair value $ 0.7 $ 1.8
Weighted-average useful life 1 year 11 months 2 years 11 months