Annual report pursuant to Section 13 and 15(d)

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

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GOODWILL AND OTHER INTANGIBLE ASSETS - Purchased Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,820.5 $ 1,876.9
Accumulated Amortization (775.9) (777.7)
Net 1,044.6 1,099.2
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 904.0 911.4
Accumulated Amortization (351.8) (298.7)
Net 552.2 612.7
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 110.1 130.3
Accumulated Amortization (84.0) (84.1)
Net 26.1 46.2
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 673.0 693.1
Accumulated Amortization (305.1) (295.2)
Net 367.9 397.9
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 108.3 46.3
Accumulated Amortization (20.9) (12.5)
Net 87.4 33.8
Non-compete agreements    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 7.8 3.8
Accumulated Amortization (3.5) (2.2)
Net 4.3 1.6
Trade names and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 17.3 18.7
Accumulated Amortization (10.6) (11.7)
Net $ 6.7 $ 7.0