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MARKETABLE INVESTMENT SECURITIES
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE INVESTMENT SECURITIES MARKETABLE INVESTMENT SECURITIES
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 December 31, 2023 and December 31, 2022 were as follows:
(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 equivalents2.2 — — 2.2 
Total cash and cash equivalents132.1 — — 132.1 
Available-for-sale:
Corporate bonds and notes8.4 — (0.1)8.3 
Municipal bonds0.5 — — 0.5 
Total$141.0 $— $(0.1)$140.9 
(in millions)Amortized
cost		Gross
unrealized
holding
gains		Gross
unrealized
holding
losses		Estimated
fair value
December 31, 2022:
Cash and cash equivalents:
Cash$53.6 $— $— $53.6 
Cash equivalents3.3 — — 3.3 
Total cash and cash equivalents56.9 — — 56.9 
Available-for-sale:
Corporate bonds and notes66.7 — (1.6)65.1 
Municipal bonds16.3 — (0.3)16.0 
Federal agency issues20.7 — (0.7)20.0 
U.S. government securities11.8 — (0.1)11.7 
Total$172.4 $— $(2.7)$169.7 
Cash, cash equivalents, and maturities of debt securities classified as available-for-sale were as follows at December 31, 2023:
(in millions)Amortized
cost		Estimated
fair value
Cash$129.9 $129.9 
Cash equivalents2.2 2.2 
Available-for-sale:
Due within one year8.9 8.8 
Total$141.0 $140.9 
During the years ended December 31, 2023, 2022, and 2021, the Company sold $90.4 million, $28.4 million, and $8.3 million of investments, respectively. The cost of the available for sale security sold was determined using the specific-identification method. The amount of gross realized gains and realized losses upon sales of investments was $1.5 million for the year ended December 31, 2023 and was insignificant for the years ended December 31, 2022 and 2021. As of December 31, 2023, the Company had 7 available-for-sale debt securities in a gross unrealized loss position of $0.1 million, with a fair market value of $8.8 million. As of December 31, 2022, the Company had 118 available-for-sale debt securities in a gross unrealized loss position of $2.7 million, with a fair market value of $111.6 million. As of December 31, 2023 and 2022, the expected losses were determined to be immaterial and as such, the Company did not record an allowance for credit losses. The Company does not intend to sell these available-for-sale debt securities, and it is not more likely than not that it will be required to sell these securities prior to recovery of their amortized cost basis. Additional information relating to fair value of marketable investment securities can be found in Note 3.