MARKETABLE SECURITIES - Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Less than one year	$ 15.9
One to five years	30.9
Six to ten years	38.1
Greater than ten years	84.6
Amortized Cost	169.5	$ 201.6
Fair Value
Less than one year	15.9
One to five years	30.9
Six to ten years	37.8
Greater than ten years	79.7
Total Debt Securities	$ 164.3	$ 185.5

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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-Topic 944
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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