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, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,083.3 $ 1,878.6
Accumulated Amortization (861.4) (880.8)
Net 1,221.9 997.8
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,121.8 913.7
Accumulated Amortization (435.8) (399.2)
Net 686.0 514.5
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 737.0 680.1
Accumulated Amortization (350.7) (331.4)
Net 386.3 348.7
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 165.4 148.6
Accumulated Amortization (41.9) (30.7)
Net 123.5 117.9
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 28.9 115.3
Accumulated Amortization (17.7) (106.6)
Net 11.2 8.7
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 19.3 14.4
Accumulated Amortization (11.3) (9.4)
Net 8.0 5.0
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 10.9 6.5
Accumulated Amortization (4.0) (3.5)
Net $ 6.9 $ 3.0