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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in Amount of Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Beginning Balance | $ 3,974.3 | $ 2,571.0
Acquisitions | 92.4 | 1,456.3
Adjustments to initial purchase price allocation | 1.0 | (6.4)
Foreign currency translation | 116.3 | (46.6)
Ending Balance | 4,184.0 | 3,974.3
U.S. Information Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 1,071.3 | 1,071.3
Acquisitions | 0.0 | 0.0
Adjustments to initial purchase price allocation | 0.0 | 0.0
Foreign currency translation | 0.0 | 0.0
Ending Balance | 1,071.3 | 1,071.3
International |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 1,814.6 | 441.5
Acquisitions | 43.9 | 1,411.6
Adjustments to initial purchase price allocation | 1.0 | (6.2)
Foreign currency translation | 109.9 | (32.3)
Ending Balance | 1,969.4 | 1,814.6
Workforce Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 952.1 | 907.6
Acquisitions | 0.0 | 44.7
Adjustments to initial purchase price allocation | 0.0 | (0.2)
Foreign currency translation | 0.0 | 0.0
Ending Balance | 952.1 | 952.1
Global Consumer Solutions |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 136.3 | 150.6
Acquisitions | 48.5 | 0.0
Adjustments to initial purchase price allocation | 0.0 | 0.0
Foreign currency translation | 6.4 | (14.3)
Ending Balance | $ 191.2 | $ 136.3

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