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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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