INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Effective income tax rate	33.00%	36.20%
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense					$ 8.1
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, additional amounts, provisional income tax expense					$ 1.2
Increase in the effective tax rate as a result of Tax Cuts and Jobs Act of 2017, transition tax	3.50%
Tax Cuts And Jobs Act Of 2017, global intangible low-taxed income, provisional income tax expense (benefit)	$ 0.6
Increase in the effective income tax rate due to GILTI tax	1.70%
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax expense (benefit)			$ 9.9
Undistributed foreign earnings	$ 160.0		$ 160.0
Her Majesty's Revenue and Customs (HMRC)
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, change in enacted tax rate, percent	1.60%	2.30%
Canada Revenue Agency | Scenario, Forecast
Income Tax Contingency [Line Items]
Expected tax if earnings were distributed to the U.S.				$ 8.0