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
Sep. 30, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,144.0 $ 1,878.6
Accumulated Amortization (872.4) (880.8)
Net 1,271.6 997.8
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,107.4 913.7
Accumulated Amortization (449.4) (399.2)
Net 658.0 514.5
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 788.5 680.1
Accumulated Amortization (348.9) (331.4)
Net 439.6 348.7
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 190.1 148.6
Accumulated Amortization (44.8) (30.7)
Net 145.3 117.9
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 26.5 115.3
Accumulated Amortization (13.8) (106.6)
Net 12.7 8.7
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 20.4 14.4
Accumulated Amortization (12.3) (9.4)
Net 8.1 5.0
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 11.1 6.5
Accumulated Amortization (3.2) (3.5)
Net $ 7.9 $ 3.0