INVESTMENTS (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) security	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Debt securities and equity securities held in an unrealized loss position 12 months or more | security	42		42		371
OTTI losses | $	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Fair value of investments deposited with governmental authorities required by law | $	$ 10.8		$ 10.8		$ 10.3
Debt securities, available-for-sale, unrealized loss position, number of positions | security	106		106		1,222