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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Cost
Due in 1 year or less	$ 20.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Cost	20.0	$ 388.2
Fair Value
Due in 1 year or less	20.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Total	20.0	388.2
Cost
Due in 1 year or less	223.2
Due after 1 year through 5 years	385.6
Instruments not due at a single maturity date	102.5
Cost	711.3	685.3
Fair Value
Due in 1 year or less	222.4
Due after 1 year through 5 years	381.7
Instruments not due at a single maturity date	102.1
Total	$ 706.2	$ 683.2

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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