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, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,836.3 $ 1,876.9
Accumulated Amortization (732.2) (777.7)
Net 1,104.1 1,099.2
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 903.1 911.4
Accumulated Amortization (324.2) (298.7)
Net 578.9 612.7
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 111.4 130.3
Accumulated Amortization (75.7) (84.1)
Net 35.7 46.2
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 685.0 693.1
Accumulated Amortization (300.0) (295.2)
Net 385.0 397.9
Reacquired rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 0.0 73.3
Accumulated Amortization 0.0 (73.3)
Net 0.0 0.0
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 108.9 46.3
Accumulated Amortization (16.8) (12.5)
Net 92.1 33.8
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.5 3.8
Accumulated Amortization (3.0) (2.2)
Net 4.5 1.6
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 20.4 18.7
Accumulated Amortization (12.5) (11.7)
Net $ 7.9 $ 7.0