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, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,799.5 $ 1,876.9
Accumulated Amortization (715.9) (777.7)
Net 1,083.6 1,099.2
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 912.3 911.4
Accumulated Amortization (311.1) (298.7)
Net 601.2 612.7
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 114.1 130.3
Accumulated Amortization (72.5) (84.1)
Net 41.6 46.2
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 698.8 693.1
Accumulated Amortization (303.7) (295.2)
Net 395.1 397.9
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 49.8 46.3
Accumulated Amortization (13.9) (12.5)
Net 35.9 33.8
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 5.5 3.8
Accumulated Amortization (2.6) (2.2)
Net 2.9 1.6
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 19.0 18.7
Accumulated Amortization (12.1) (11.7)
Net $ 6.9 $ 7.0