Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
GOODWILL AND OTHER INTANGIBLE ASSETS (Purchased Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 2,000.1 $ 2,032.6
Accumulated Amortization (753.1) (708.8)
Net 1,247.0 1,323.8
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 955.7 1,012.7
Accumulated Amortization (262.2) (276.0)
Net 693.5 736.7
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 142.3 131.5
Accumulated Amortization (66.6) (36.1)
Net 75.7 95.4
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 772.4 712.7
Accumulated Amortization (326.7) (273.0)
Net 445.7 439.7
Reacquired rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 73.3 73.3
Accumulated Amortization (65.6) (52.5)
Net 7.7 20.8
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 22.1 21.5
Accumulated Amortization (8.7) (6.7)
Net 13.4 14.8
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 14.1 26.8
Accumulated Amortization (12.7) (22.2)
Net 1.4 4.6
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 20.2 54.1
Accumulated Amortization (10.6) (42.3)
Net $ 9.6 $ 11.8