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, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,833.4 $ 1,820.5
Accumulated Amortization (832.0) (775.9)
Net 1,001.4 1,044.6
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 884.7 904.0
Accumulated Amortization (375.2) (351.8)
Net 509.5 552.2
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 106.9 110.1
Accumulated Amortization (94.3) (84.0)
Net 12.6 26.1
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 672.0 673.0
Accumulated Amortization (323.6) (305.1)
Net 348.4 367.9
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 148.5 108.3
Accumulated Amortization (26.4) (20.9)
Net 122.1 87.4
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 6.0 7.8
Accumulated Amortization (2.7) (3.5)
Net 3.3 4.3
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 15.3 17.3
Accumulated Amortization (9.8) (10.6)
Net $ 5.5 $ 6.7