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MARKETABLE INVESTMENT SECURITIES | 3 Months Ended
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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 equivalents | 1.7 |  |  | — |  |  | — |  |  | 1.7 |
Total cash and cash equivalents | 53.6 |  |  | — |  |  | — |  |  | 53.6 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 29.3 |  |  | — |  |  | (0.9) |  |  | 28.4 |
Municipal bonds | 8.7 |  |  | — |  |  | (0.1) |  |  | 8.6 |
Federal agency issues | 14.5 |  |  | — |  |  | (0.4) |  |  | 14.1 |
U.S. government securities | 4.5 |  |  | — |  |  | (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 equivalents | 3.3 |  |  | — |  |  | — |  |  | 3.3 |
Total cash and cash equivalents | 56.9 |  |  | — |  |  | — |  |  | 56.9 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 66.7 |  |  | — |  |  | (1.6) |  |  | 65.1 |
Municipal bonds | 16.3 |  |  | — |  |  | (0.3) |  |  | 16.0 |
Federal agency issues | 20.7 |  |  | — |  |  | (0.7) |  |  | 20.0 |
U.S. government securities | 11.8 |  |  | — |  |  | (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 equivalents | 1.7 |  |  | 1.7 |
Available-for-sale: |  |  |
Due within one year | 25.4 |  |  | 25.1 |
Due after one year through five years | 31.6 |  |  | 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.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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