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Marketable Investment Securities | 3 Months Ended
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Mar. 31, 2022
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, 2022 and December 31, 2021 were as follows:
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
March 31, 2022 |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 138.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 138.0 |
Cash equivalents | 27.2 |  |  | — |  |  | — |  |  | 27.2 |
Total cash and cash equivalents | 165.2 |  |  | — |  |  | — |  |  | 165.2 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 109.1 |  |  | — |  |  | (1.0) |  |  | 108.1 |
Municipal bonds | 21.6 |  |  | — |  |  | (0.2) |  |  | 21.4 |
Federal agency issues | 18.0 |  |  | — |  |  | (0.3) |  |  | 17.7 |
US government securities | 27.0 |  |  | — |  |  | (0.2) |  |  | 26.8 |
Total | $ | 340.9 |  |  | $ | — |  |  | $ | (1.7) |  |  | $ | 339.2 |
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2021: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 195.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 195.2 |
Cash equivalents | 63.2 |  |  | — |  |  | — |  |  | 63.2 |
Total cash and cash equivalents | 258.4 |  |  | — |  |  | — |  |  | 258.4 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 105.7 |  |  | 0.1 |  |  | (0.2) |  |  | 105.6 |
Municipal bonds | 16.1 |  |  | — |  |  | — |  |  | 16.1 |
Federal agency issues | 6.8 |  |  | — |  |  | — |  |  | 6.8 |
US government securities | 11.9 |  |  | — |  |  | — |  |  | 11.9 |
Total | $ | 398.9 |  |  | $ | 0.1 |  |  | $ | (0.2) |  |  | $ | 398.8 |
Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at March 31, 2022:
(in millions) | Amortized cost |  | Estimated fair value
Cash | $ | 138.0 |  |  | $ | 138.0 |
Cash equivalents | 27.2 |  |  | 27.2 |
Available-for-sale: |  |  |
Due within one year | 103.4 |  |  | 103.2 |
Due after one year through five years | 72.3 |  |  | 70.8 |
Due after five years | — |  |  | — |
Total | $ | 340.9 |  |  | $ | 339.2 |
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 http://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 http://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 http://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 http://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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