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Debt Securities | 3 Months Ended
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Mar. 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), allowance for credit losses, and fair value of debt securities available-for-sale at March 31, 2021, aggregated by major security type and contractual maturity:
(in millions) | Contractual Maturity |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Commercial paper | Within 1 year |  | $ | 93.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 93.2 |
Corporate debt securities | Within 1 year |  | 239.6 |  |  | 0.9 |  |  | — |  |  | — |  |  | 240.5 |
Securities of government-sponsored entities | Within 1 year |  | 187.4 |  |  | — |  |  | — |  |  | — |  |  | 187.4 |
|  |  | $ | 520.2 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 521.1 |
Corporate debt securities | 1 to 2 years |  | $ | 169.0 |  |  | $ | 0.1 |  |  | $ | (0.2) |  |  | $ | — |  |  | $ | 168.9 |
Securities of government-sponsored entities | 1 to 2 years |  | 80.6 |  |  | 0.1 |  |  | — |  |  | — |  |  | 80.7 |
|  |  | $ | 249.6 |  |  | $ | 0.2 |  |  | $ | (0.2) |  |  | $ | — |  |  | $ | 249.6 |
The following table summarizes the amortized cost, unrealized gain and loss recognized in accumulated other comprehensive income (loss), allowance for credit losses, and fair value of debt securities available-for-sale at December 31, 2020, aggregated by major security type and contractual maturity:
(in millions) | Contractual Maturity |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Commercial paper | Within 1 year |  | $ | 82.2 |  |  | $ | — |  |  | $ | — |  |  | — |  |  | $ | 82.2 |
Corporate debt securities | Within 1 year |  | 299.3 |  |  | 1.4 |  |  | — |  |  | — |  |  | 300.7 |
Securities of government-sponsored entities | Within 1 year |  | 230.9 |  |  | 0.1 |  |  | — |  |  | — |  |  | 231.0 |
|  |  | $ | 612.4 |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 613.9 |
Corporate debt securities | 1 to 2 years |  | $ | 144.8 |  |  | $ | 0.4 |  |  | $ | — |  |  | — |  |  | $ | 145.2 |
Securities of government-sponsored entities | 1 to 2 years |  | 81.9 |  |  | 0.1 |  |  | (0.1) |  |  | — |  |  | 81.9 |
|  |  | $ | 226.7 |  |  | $ | 0.5 |  |  | $ | (0.1) |  |  | $ | — |  |  | $ | 227.1 |
The following table summarizes debt securities available-for-sale in an unrealized loss position for which an allowance for credit losses has not been recorded at March 31, 2021 and December 31, 2020, aggregated by major security type and length of time in a continuous unrealized 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
March 31, 2021: |  |  |  |  |  |  |  |  |  |  |
Corporate Debt Securities | $ | 164.6 |  |  | $ | (0.2) |  |  | $ | — |  |  | $ | — |  |  | $ | 164.6 |  |  | $ | (0.2) |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |
Securities of government-sponsored entities | $ | 95.0 |  |  | $ | (0.1) |  |  | $ | — |  |  | $ | — |  |  | $ | 95.0 |  |  | $ | (0.1) |
At March 31, 2021, our security portfolio consisted of 126 securities related to investments in debt securities available-for-sale, of which 39 securities were in an unrealized loss position. Our investments in corporate debt securities in an unrealized loss position at March 31, 2021 are of high credit quality (rated A or higher). 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. Accrued interest receivables on debt securities available-for-sale totaled $3.2 million and $3.7 million at March 31, 2021 and December 31, 2020, respectively. 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, 2021 or 2020.

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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 + Details
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