Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details)

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Purchased Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,771.6 $ 1,820.5
Accumulated Amortization (771.0) (775.9)
Net 1,000.6 1,044.6
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 857.6 904.0
Accumulated Amortization (353.8) (351.8)
Net 503.8 552.2
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 92.8 110.1
Accumulated Amortization (74.0) (84.0)
Net 18.8 26.1
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 650.3 673.0
Accumulated Amortization (306.4) (305.1)
Net 343.9 367.9
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 149.2 108.3
Accumulated Amortization (24.8) (20.9)
Net 124.4 87.4
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.0 7.8
Accumulated Amortization (3.1) (3.5)
Net 3.9 4.3
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 14.7 17.3
Accumulated Amortization (8.9) (10.6)
Net $ 5.8 $ 6.7