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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Cost
Due in 1 year or less	$ 190.0
Due after 1 year through 5 years	0.0
Due after 5 years through 10 years	0.0
Instruments not due at a single maturity date	0.0
Cost	190.0	$ 388.2
Fair Value
Due in 1 year or less	190.0
Due after 1 year through 5 years	0.0
Due after 5 years through 10 years	0.0
Instruments not due at a single maturity date	0.0
Fair Value	190.0	388.2
Cost
Due in 1 year or less	145.2
Due after 1 year through 5 years	372.0
Due after 5 years through 10 years	1.0
Instruments not due at a single maturity date	87.6
Cost	605.8	685.3
Fair Value
Due in 1 year or less	144.4
Due after 1 year through 5 years	368.9
Due after 5 years through 10 years	1.0
Instruments not due at a single maturity date	86.9
Fair Value	$ 601.2	$ 683.2

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