ASBESTOS AND ENVIRONMENTAL CLAIMS (Details) $ in Millions	12 Months Ended	96 Months Ended
	Dec. 31, 2016 USD ($) claim policyholder lawsuit	Dec. 31, 2016 USD ($) claim lawsuit	Dec. 31, 2015 USD ($)
Liability for Asbestos and Environmental Claims [Abstract]
Average asbestos and environmental losses paid by company per year over past five years	$ 2.0
Reserves for asbestos and environmental related claims, before reinsurance	13.3	$ 13.3	$ 11.5
Reserves for asbestos and environmental related claims, net of reinsurance	$ 13.0	$ 13.0	$ 11.2
Number of asbestos bodily injury lawsuits | lawsuit	1,856	1,856
Number of policyholders producing recent higher paid asbestos amounts | policyholder	1
Company's share of asbestos related claims settled		$ 11.2
Number of asbestos exposure claims associated with furnace manufacturer, a former policyholder, remain open | claim	728	728
Asbestos reserve strengthening	$ 3.5