STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS - (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
STATUTORY ACCOUNTING AND DIVIDEND RESTRICTIONS [Abstract]
Carryforward period for statutory unassigned surplus included in consideration of dividend to be paid	2 years
Percentage of statutory unassigned surplus as of preceding year included in consideration of dividend to be paid	10.00%
Percentage of insurers capital surplus considered for dividend distribution	10.00%
Percentage of minimum statutory capital surplus after the dividend or distribution	115.00%
Number of business days prior to dividend payment	10 years
Statutory capital and surplus	$ 188.0	$ 172.1
Statutory Accounting Practices, Statutory Net Income Amount	$ (19.6)	$ (37.0)	$ 23.9