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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |
Beginning Balance | $ 6,383.9 | $ 6,258.1
Acquisitions | 410.4 | 283.8
Adjustments to initial purchase price allocation | 2.8 | 0.1
Foreign currency translation | 32.8 | (133.5)
Divestitures |  | (24.6)
Ending Balance | 6,829.9 | 6,383.9
Workforce Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 2,520.8 | 2,365.4
Acquisitions | 0.0 | 145.0
Adjustments to initial purchase price allocation | (0.7) | 10.7
Foreign currency translation | 0.1 | (0.3)
Divestitures |  | 0.0
Ending Balance | 2,520.2 | 2,520.8
U.S. Information Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 2,004.8 | 1,900.1
Acquisitions | 0.0 | 111.8
Adjustments to initial purchase price allocation | 1.4 | (7.1)
Foreign currency translation | 0.0 | 0.0
Divestitures |  | 0.0
Ending Balance | 2,006.2 | 2,004.8
International |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 1,858.3 | 1,992.6
Acquisitions | 410.4 | 27.0
Adjustments to initial purchase price allocation | 2.1 | (3.5)
Foreign currency translation | 32.7 | (133.2)
Divestitures |  | (24.6)
Ending Balance | $ 2,303.5 | $ 1,858.3

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