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Debt Securities | 3 Months Ended
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Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Debt Securities | Debt Securities The following table presents the amortized cost, unrealized gain and loss recognized in accumulated other comprehensive income (loss) and fair value of debt securities available-for-sale, aggregated by major security type and contractual maturity.
|  |  | March 31, 2022 |  | December 31, 2021
(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 |  | $ | 99.1 |  |  | $ | — |  |  | $ | (0.4) |  |  | $ | 98.7 |  |  | $ | 204.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 204.8 |
Corporate debt securities | 0 to 1 years |  | 163.7 |  |  | — |  |  | (1.1) |  |  | 162.6 |  |  | 128.2 |  |  | — |  |  | (0.1) |  |  | 128.1 |
Securities of government-sponsored entities | 0 to 1 years |  | 134.6 |  |  | — |  |  | (1.2) |  |  | 133.4 |  |  | 37.6 |  |  | — |  |  | — |  |  | 37.6 |
|  |  | $ | 397.4 |  |  | $ | — |  |  | $ | (2.7) |  |  | $ | 394.7 |  |  | $ | 370.6 |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | 370.5 |
Corporate debt securities | 1 to 3 years |  | $ | 341.8 |  |  | $ | — |  |  | $ | (5.2) |  |  | $ | 336.6 |  |  | $ | 358.9 |  |  | $ | — |  |  | $ | (1.5) |  |  | $ | 357.4 |
Securities of government-sponsored entities | 1 to 3 years |  | 209.3 |  |  | — |  |  | (4.9) |  |  | 204.4 |  |  | 204.3 |  |  | — |  |  | (1.0) |  |  | 203.3 |
|  |  | $ | 551.1 |  |  | $ | — |  |  | $ | (10.1) |  |  | $ | 541.0 |  |  | $ | 563.2 |  |  | $ | — |  |  | $ | (2.5) |  |  | $ | 560.7 |
As of March 31, 2022, our security portfolio consisted of 174 debt securities available-for-sale, including 168 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. No allowance for credit losses was recognized as of March 31, 2022 or December 31, 2021. The following table presents debt securities available-for-sale that were in an unrealized loss position as of March 31, 2022, aggregated by major security type and length of time in a continuous loss position.
| Less Than 12 Months |  | 12 Months or Longer |  | Total
(in millions) | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Commercial paper | $ | 82.0 |  |  | $ | (0.4) |  |  | $ | — |  |  | $ | — |  |  | $ | 82.0 |  |  | $ | (0.4) |
Corporate debt securities | $ | 464.0 |  |  | $ | (5.9) |  |  | $ | 18.8 |  |  | $ | (0.4) |  |  | $ | 482.8 |  |  | $ | (6.3) |
Securities of government-sponsored entities | $ | 326.1 |  |  | $ | (5.8) |  |  | $ | 10.7 |  |  | $ | (0.3) |  |  | $ | 336.8 |  |  | $ | (6.1) |
The following table presents debt securities available-for-sale that were in an unrealized loss position as of December 31, 2021, aggregated by major security type and length of time in a continuous loss position.
| Less Than 12 Months |  | 12 Months or Longer |  | Total
(in millions) | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
Corporate debt securities | $ | 428.6 |  |  | $ | (1.6) |  |  | $ | — |  |  | $ | — |  |  | $ | 428.6 |  |  | $ | (1.6) |
Securities of government-sponsored entities | $ | 230.5 |  |  | $ | (1.0) |  |  | $ | — |  |  | $ | — |  |  | $ | 230.5 |  |  | $ | (1.0) |
Accrued interest receivables on debt securities available-for-sale totaled $3.0 million and $2.2 million, respectively, as of March 31, 2022 and December 31, 2021. We do not measure an allowance for credit losses for accrued interest receivables. For the purposes of identifying and measuring an impairment, accrued interest is excluded from both the fair value and amortized cost basis of the debt security. Uncollectible accrued interest receivables associated with an impaired debt security are reversed against interest income upon identification of the impairment. No accrued interest receivables were written off during the three months ended March 31, 2022 or 2021.

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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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