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, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,104.3 $ 1,878.6
Accumulated Amortization (838.8) (880.8)
Net 1,265.5 997.8
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,145.1 913.7
Accumulated Amortization (417.4) (399.2)
Net 727.7 514.5
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 44.5 115.3
Accumulated Amortization (32.5) (106.6)
Net 12.0 8.7
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 686.2 680.1
Accumulated Amortization (339.3) (331.4)
Net 346.9 348.7
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 201.2 148.6
Accumulated Amortization (36.0) (30.7)
Net 165.2 117.9
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 9.3 6.5
Accumulated Amortization (3.5) (3.5)
Net 5.8 3.0
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 18.0 14.4
Accumulated Amortization (10.1) (9.4)
Net $ 7.9 $ 5.0