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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 155.5
Due after 1 year through 5 years	569.7
Instruments not due at a single maturity date	189.5
Amortized Cost	914.7	$ 924.3
Fair Value
Due in 1 year or less	156.4
Due after 1 year through 5 years	573.3
Instruments not due at a single maturity date	191.3
Fair Value	$ 921.0	$ 935.9

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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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), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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