INCOME TAXES - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income tax expense	$ 25.9	$ 40.6	$ 42.4	$ 60.3
Effective income tax rate	18.90%	31.80%	13.10%	25.00%
Change to Provisional One-Time US Tax Expense on Post 1986 Foreign Earnings			$ 3.1
One Time Provisional US Tax Expense on Post 1986 Foreign Earnings			54.9		$ 58.0
Existing Post 1986 Foreign Earnings Subject to One Time US Tax			975.0
Write-Off of Deferred Tax Assets Relating to Officer Compensation			1.7
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 10.0		10.0
German Deferred Tax Assets [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ 23.5