SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Gain (loss) on foreign exchange of intercompany notes of long-term nature			$ (1.2)	$ (56.5)	$ 5.8
Foreign currency exchange expense (income)			13.0	(5.8)	$ 7.1
Value of receivables sold	$ 16.4	$ 32.7
Cash proceeds from sale of receivables	$ 15.6	30.4
Contingent consideration, percent of receivables due	0.20
Receivables due of contingent consideration	$ 2.7		2.7
Finite-Lived Intangible Assets [Line Items]
Inventories of spare parts related to long term assets	31.0	32.4	31.0	32.4
Operating lease assets	53.7		53.7
Investments in marketable securities relating to deferred compensation arrangement	$ 1.4	1.8	$ 1.4	1.8
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets			4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives of intangible assets			50 years
Fermavi
Schedule of Equity Method Investments [Line Items]
Ownership interest in investment	50.00%		50.00%
Basis difference	$ 4.0	$ 4.0	$ 4.0	$ 4.0