BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 13.6
Operating lease, liability	$ 13.6
Operating lease, weighted average remaining lease term	80 years
Operating lease, weighted average discount rate, percent	3.00%
Cumulative effect of new accounting principle in period of adoption				$ 9.3
Deferred taxes, net	$ 24.4		$ 24.7
Accumulated Deficit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption				9.3
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset		$ 13.6
Operating lease, liability		$ 13.6
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred taxes, net				9.3
Accounting Standards Update 2016-09 [Member] | Accumulated Deficit [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ 9.3