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, 2023
Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross $ 3,219.9 $ 2,937.1
Accumulated Amortization (1,361.1) (1,118.6)
Net 1,858.8 1,818.5
Purchased data files    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,158.5 1,090.0
Accumulated Amortization (604.2) (527.8)
Net 554.3 562.2
Proprietary database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 705.8 705.9
Accumulated Amortization (171.5) (115.0)
Net 534.3 590.9
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 1,053.5 874.6
Accumulated Amortization (484.2) (407.4)
Net 569.3 467.2
Acquired software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 222.5 225.4
Accumulated Amortization (75.4) (42.6)
Net 147.1 182.8
Trade names, non-compete agreements and other intangible assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross 79.6 41.2
Accumulated Amortization (25.8) (25.8)
Net $ 53.8 $ 15.4