INCOME TAXES INCOME TAXES (Tax Cuts and Jobs Act) (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Provision for income taxes		$ 13.4
Net deferred tax liabilities		13.4
Transition tax on foreign earnings		18.2
Deferred tax liabilities prior to tax assessment		5.5
Income tax liability on transition tax			$ 23.7
Finalized transition tax due to TCJA		23.6
Period of finalized transition tax	8
Amount of taxes paid due to TCJA		1.9
Operating loss carryforwards			12.7
Transition tax liability due to operating loss carryforward			9.0
Provisional undistributed income tax expense		3.8
Additional tax expense on foreign withholding taxes		$ 9.3	$ 6.5