Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS (Purchased Intangible Assets) (Details)

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GOODWILL AND INTANGIBLE ASSETS (Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,105.2 $ 1,439.8
Accumulated Amortization (698.8) (611.9)
Net 1,406.4 827.9
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,041.0 665.9
Accumulated Amortization (264.9) (240.6)
Net 776.1 425.3
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 149.9 52.4
Accumulated Amortization (44.3) (35.5)
Net 105.6 16.9
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 733.8 565.9
Accumulated Amortization (270.5) (239.3)
Net 463.3 326.6
Reacquired rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 73.3 73.3
Accumulated Amortization (49.2) (39.4)
Net 24.1 33.9
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 21.5 7.4
Accumulated Amortization (6.3) (5.8)
Net 15.2 1.6
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 27.8 25.8
Accumulated Amortization (21.1) (18.3)
Net 6.7 7.5
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 57.9 49.1
Accumulated Amortization (42.5) (33.0)
Net $ 15.4 $ 16.1