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INCOME TAX - Reconciliation (Details) | 7 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Federal U.S. statutory rate | 35.00% | 21.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit | 0.60% | 2.70% | 1.90% | 0.40%
Foreign income taxes (primarily U.K.) | (12.60%) | (0.50%) | (12.00%) | (10.10%)
Foreign interest income not subject to tax | (2.30%) | (1.70%) | (2.20%) | (2.60%)
Federal U.S. transition tax | 0.00% | (4.10%) | 16.20% | 0.00%
Federal U.S. rate reduction | 0.00% | 0.00% | (55.60%) | 0.00%
Other SAB 118 adjustments | (0.00%) | (0.60%) | (0.00%) | (0.00%)
Share-based compensation expense | (0.00%) | (2.10%) | (4.20%) | (0.00%)
Foreign-derived intangible income deduction | (0.00%) | (1.60%) | (0.00%) | (0.00%)
Taxes on unremitted earnings | (0.00%) | (0.00%) | (0.00%) | (3.50%)
Valuation allowance | 0.00% | 1.40% | (3.20%) | 0.00%
Other | (0.10%) | (0.70%) | (1.70%) | 0.40%
Effective tax rate | 20.60% | 13.80% | (25.80%) | 19.60%

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