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Debt Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Debt Securities Available-For-Sale | 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 |
Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position | 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) |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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