Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
GOODWILL AND OTHER INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,876.9 $ 2,000.1
Accumulated Amortization (777.7) (753.1)
Net 1,099.2 1,247.0
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 911.4 955.7
Accumulated Amortization (298.7) (262.2)
Net 612.7 693.5
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 130.3 142.3
Accumulated Amortization (84.1) (66.6)
Net 46.2 75.7
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 693.1 772.4
Accumulated Amortization (295.2) (326.7)
Net 397.9 445.7
Reacquired rights    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 73.3 73.3
Accumulated Amortization (73.3) (65.6)
Net 0.0 7.7
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 46.3 22.1
Accumulated Amortization (12.5) (8.7)
Net 33.8 13.4
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 3.8 14.1
Accumulated Amortization (2.2) (12.7)
Net 1.6 1.4
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 18.7 20.2
Accumulated Amortization (11.7) (10.6)
Net $ 7.0 $ 9.6