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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Cost
Due in 1 year or less	$ 45.7
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	3.0
Cost	48.7	$ 388.2
Fair Value
Due in 1 year or less	45.7
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	3.0
Fair Value	48.7	388.2
Cost
Due in 1 year or less	129.3
Due after 1 year through 5 years	361.7
Instruments not due at a single maturity date	92.0
Cost	583.0	685.3
Fair Value
Due in 1 year or less	128.7
Due after 1 year through 5 years	357.6
Instruments not due at a single maturity date	91.2
Fair Value	$ 577.5	$ 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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