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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cost |  |
Due in 1 year or less | $ 169.9 |
Due after 1 year through 5 years | 292.4 |
Instruments not due at a single maturity date | 63.9 |
Cost | 526.2 | $ 711.3
Fair Value |  |
Due in 1 year or less | 170.3 |
Due after 1 year through 5 years | 294.5 |
Instruments not due at a single maturity date | 64.5 |
Fair Value | $ 529.3 | $ 706.2

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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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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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), 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. + References No definition available. + Details
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