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MARKETABLE INVESTMENT SECURITIES
3 Months Ended
Mar. 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 available-for-sale securities by major security type and class of security at March 31, 2023 and December 31, 2022 were as follows:
(in millions)Amortized
cost
Gross
unrealized
holding
gains
Gross
unrealized
holding
losses
Estimated
fair value
March 31, 2023
Cash and cash equivalents:
Cash$51.9 $— $— $51.9 
Cash equivalents1.7 — — 1.7 
Total cash and cash equivalents53.6 — — 53.6 
Available-for-sale:
Corporate bonds and notes29.3 — (0.9)28.4 
Municipal bonds8.7 — (0.1)8.6 
Federal agency issues14.5 — (0.4)14.1 
U.S. government securities4.5 — (0.1)4.4 
Total$110.6 $— $(1.5)$109.1 
(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 securities were as follows at March 31, 2023:
(in millions)Amortized
cost
Estimated
fair value
Cash$51.9 $51.9 
Cash equivalents1.7 1.7 
Available-for-sale:
Due within one year25.4 25.1 
Due after one year through five years31.6 30.4 
Due after five years— — 
Total$110.6 $109.1 
The Company does not intend to sell these available-for-sale debt securities, and it is not more likely than not that the Company 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 4.