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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, 2019	Dec. 31, 2018
Cost
Due in 1 year or less	$ 100.2
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Cost	100.2
Fair Value
Due in 1 year or less	100.2
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Total	100.2
Cost
Due in 1 year or less	237.2
Due after 1 year through 5 years	439.1
Instruments not due at a single maturity date	114.2
Cost	790.5	$ 711.3
Fair Value
Due in 1 year or less	237.6
Due after 1 year through 5 years	441.7
Instruments not due at a single maturity date	114.5
Total	$ 793.8	$ 706.2

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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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