INCOME TAXES - Summary of Net Tax Benefit Recognized Related to Tax Act (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Remeasurement of net deferred tax liabilities due to enacted rate reduction		$ 167.7
Section 965 transition tax on foreign earnings		(24.3)
Foreign withholding taxes on such earnings		(13.6)
Net tax benefit from the Tax Act	$ 129.8	$ 129.8