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INCOME TAXES - Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 35.00%
Provision computed at federal statutory rate | $ (90.9) | $ 74.8 | $ 261.3
State and local taxes, net of federal tax benefit | (7.3) | 10.7 | 13.3
Foreign | (2.1) | 0.1 | (41.9)
Tax Cuts and Jobs Act of 2017 | 0.0 | 0.0 | (48.3)
Federal research & development credit | (14.9) | (13.0) | (6.7)
Equity compensation | (3.0) | (7.5) | (26.7)
Tax reserves | 1.2 | 2.4 | 2.5
Equifax Australia settlement | 0.0 | (14.1) | 0.0
Legal settlement | 69.1 | 0.0 | 0.0
Excess officer’s compensation | 5.1 | 2.7 | 0.0
Other | 2.6 | (6.1) | (4.9)
(Benefit) Provision for income taxes | $ (40.2) | $ 50.0 | $ 148.6
Effective income tax rate | 9.30% | 14.00% | 19.90%

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