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
Jun. 30, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,065.0 $ 1,439.8
Accumulated Amortization (660.1) (611.9)
Net 1,404.9 827.9
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,024.6 665.9
Accumulated Amortization (247.5) (240.6)
Net 777.1 425.3
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 150.2 52.4
Accumulated Amortization (40.6) (35.5)
Net 109.6 16.9
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 723.5 565.9
Accumulated Amortization (260.3) (239.3)
Net 463.2 326.6
Reacquired rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 73.3 73.3
Accumulated Amortization (46.0) (39.4)
Net 27.3 33.9
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.4 7.4
Accumulated Amortization (6.0) (5.8)
Net 1.4 1.6
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 28.2 25.8
Accumulated Amortization (20.9) (18.3)
Net 7.3 7.5
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 57.8 49.1
Accumulated Amortization (38.8) (33.0)
Net $ 19.0 $ 16.1