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Debt Securities | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Debt Securities | Debt Securities The following table summarizes the amortized cost, unrealized gain and loss recognized in accumulated other comprehensive income (loss) and fair value of debt securities available-for-sale at December 31, 2021, aggregated by major security type and contractual maturity:
|  |  | December 31, 2021 |  | December 31, 2020
(in millions) | Contractual Maturity |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Commercial paper | 0 to 1 years |  | $ | 204.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 204.8 |  |  | $ | 82.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 82.2 |
Corporate debt securities | 0 to 1 years |  | 128.2 |  |  | — |  |  | (0.1) |  |  | 128.1 |  |  | 299.3 |  |  | 1.4 |  |  | — |  |  | 300.7 |
Securities of government-sponsored entities | 0 to 1 years |  | 37.6 |  |  | — |  |  | — |  |  | 37.6 |  |  | 230.9 |  |  | 0.1 |  |  | — |  |  | 231.0 |
|  |  | $ | 370.6 |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | 370.5 |  |  | $ | 612.4 |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | 613.9 |
Corporate debt securities | 1 to 3 years |  | $ | 358.9 |  |  | $ | — |  |  | $ | (1.5) |  |  | $ | 357.4 |  |  | $ | 144.8 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 145.2 |
Securities of government-sponsored entities | 1 to 3 years |  | 204.3 |  |  | — |  |  | (1.0) |  |  | 203.3 |  |  | 81.9 |  |  | 0.1 |  |  | (0.1) |  |  | 81.9 |
|  |  | $ | 563.2 |  |  | $ | — |  |  | $ | (2.5) |  |  | $ | 560.7 |  |  | $ | 226.7 |  |  | $ | 0.5 |  |  | $ | (0.1) |  |  | $ | 227.1 |
As of December 31, 2021, our security portfolio consisted of 164 debt securities available-for-sale, including 136 such securities that were in an unrealized loss position but of high credit quality. Unrealized losses on these investments were primarily due to changes in interest rates. We do not intend to sell these investments and it is not more likely than not that we will be required to sell these investments before recovery of their amortized cost basis. We did not recognize an allowance for credit losses as of December 31, 2021 or 2020. The following table summarizes debt securities available-for-sale in an unrealized loss position for less than 12 months, aggregated by major security type. There were no debt securities available-for-sale in an unrealized loss position for longer than 12 months as of December 31, 2021 or 2020.
| December 31, 2021 |  |  |  |  |  |  |  |  | December 31, 2020
(in millions) | Fair Value |  | Unrealized Loss |  |  |  |  |  |  |  |  | Fair Value |  | Unrealized Loss
Corporate Debt Securities | $ | 428.6 |  |  | $ | (1.6) |  |  |  |  |  |  |  |  |  | $ | — |  |  | $ | — |
Securities of government-sponsored entities | 230.5 |  |  | (1.0) |  |  |  |  |  |  |  |  |  | 95.0 |  |  | (0.1) |
| $ | 659.1 |  |  | $ | (2.6) |  |  |  |  |  |  |  |  |  | $ | 95.0 |  |  | $ | (0.1) |

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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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