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Marketable Investment Securities | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 were as follows:
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
September 30, 2021 |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 208.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 208.8 |
Cash equivalents | 86.4 |  |  | — |  |  | — |  |  | 86.4 |
Total cash and cash equivalents | 295.2 |  |  | — |  |  | — |  |  | 295.2 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 90.7 |  |  | 0.2 |  |  | (0.1) |  |  | 90.8 |
Municipal bonds | 19.4 |  |  | 0.1 |  |  | — |  |  | 19.5 |
Federal agency issues | 2.6 |  |  | — |  |  | — |  |  | 2.6 |
US government securities | 5.5 |  |  | — |  |  | — |  |  | 5.5 |
Total | $ | 413.4 |  |  | $ | 0.3 |  |  | $ | (0.1) |  |  | $ | 413.6 |
(in millions) | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
December 31, 2020: |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 47.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 47.9 |
Cash equivalents | 69.1 |  |  | — |  |  | — |  |  | 69.1 |
Total cash and cash equivalents | 117.0 |  |  | — |  |  | — |  |  | 117.0 |
Available-for-sale: |  |  |  |  |  |  |
Corporate bonds and notes | 28.8 |  |  | 0.5 |  |  | — |  |  | 29.3 |
Municipal bonds | 9.4 |  |  | 0.2 |  |  | — |  |  | 9.6 |
Federal agency issues | 4.0 |  |  | — |  |  | — |  |  | 4.0 |
US government securities | 11.7 |  |  | 0.1 |  |  | — |  |  | 11.8 |
Total | $ | 170.9 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | 171.7 |
Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities were as follows at September 30, 2021:
(in millions) | Amortized cost |  | Estimated fair value
Cash | $ | 208.8 |  |  | $ | 208.8 |
Cash equivalents | 86.4 |  |  | 86.4 |
Available-for-sale: |  |  |
Due within one year | 70.7 |  |  | 70.9 |
Due after one year through five years | 47.5 |  |  | 47.5 |
Due after five years | — |  |  | — |
Total | $ | 413.4 |  |  | $ | 413.6 |
There were no debt securities classified as available-for-sale in a gross unrealized loss position as of September 30, 2021 or December 31, 2020. 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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