MARKETABLE INVESTMENT SECURITIES (Tables)

3 Months Ended

Mar. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for debt securities classified as available-for-sale securities by major security type and class of security at March 31, 2024 and December 31, 2023 were as follows:


(in millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
March 31, 2024
Cash and cash equivalents:
Cash	$	93.1	$	—	$	—	$	93.1
Cash equivalents	3.8		—		—		3.8
Total cash and cash equivalents	96.9		—		—		96.9
Available-for-sale:
Corporate bonds and notes	6.9		—		(0.1)		6.8
Municipal bonds	0.6		—		—		0.6
Federal agency issues	—		—		—		—

Total	$	104.4	$	—	$	(0.1)	$	104.3


(in millions)	Amortized cost		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
December 31, 2023
Cash and cash equivalents:
Cash	$	129.9	$	—	$	—	$	129.9
Cash equivalents	2.2		—		—		2.2
Total cash and cash equivalents	132.1		—		—		132.1
Available-for-sale:
Corporate bonds and notes	8.4		—		(0.1)		8.3
Municipal bonds	0.5		—		—		0.5


Total	$	141.0	$	—	$	(0.1)	$	140.9

Schedule of Cash, Cash Equivalents, and Maturities of Debt Securities Classified as Available-For-Sale Securities

Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at March 31, 2024:


(in millions)	Amortized cost		Estimated fair value
Cash	$	93.1	$	93.1
Cash equivalents	3.8		3.8
Available-for-sale:
Due within one year	7.5		7.4


Total	$	104.4	$	104.3