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INCOME TAXES - Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 35.00% | 35.00%
Provision computed at federal statutory rate | $ 74.8 | $ 261.3 | $ 254.9
State and local taxes, net of federal tax benefit | 10.7 | 13.3 | 17.2
Foreign | 0.1 | (41.9) | (40.3)
Tax Cuts and Jobs Act of 2017 | 0.0 | (48.3) |
Federal research & development credit | (13.0) | (6.7) | 0.0
Equity compensation | (7.5) | (26.7) | 0.0
Tax reserves | 2.4 | 2.5 | 11.9
Equifax Australia settlement | (14.1) | 0.0 | 0.0
Other | (3.4) | (4.9) | (10.6)
Provision for income taxes | $ 50.0 | $ 148.6 | $ 233.1
Effective income tax rate | 14.00% | 19.90% | 32.00%

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