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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, 2020	Dec. 31, 2019
Cost
Due in 1 year or less	$ 256.7
Due after 1 year through 5 years	395.1
Due after 5 years through 10 years	3.0
Instruments not due at a single maturity date	159.1
Cost	813.9	$ 790.5
Fair Value
Due in 1 year or less	256.2
Due after 1 year through 5 years	393.0
Due after 5 years through 10 years	3.1
Instruments not due at a single maturity date	158.4
Fair Value	$ 810.7	$ 793.8

X

- 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
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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-Topic 326
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-Section 45
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