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
Jun. 30, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,821.8 $ 1,820.5
Accumulated Amortization (809.1) (775.9)
Net 1,012.7 1,044.6
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 883.8 904.0
Accumulated Amortization (364.8) (351.8)
Net 519.0 552.2
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 104.8 110.1
Accumulated Amortization (88.0) (84.0)
Net 16.8 26.1
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 664.3 673.0
Accumulated Amortization (316.2) (305.1)
Net 348.1 367.9
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 147.0 108.3
Accumulated Amortization (27.0) (20.9)
Net 120.0 87.4
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.0 7.8
Accumulated Amortization (3.5) (3.5)
Net 3.5 4.3
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 14.9 17.3
Accumulated Amortization (9.6) (10.6)
Net $ 5.3 $ 6.7