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Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
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 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.
|  |  | June 30, 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 |  | $ | 78.2 |  |  | $ | — |  |  | $ | (0.4) |  |  | $ | 77.8 |  |  | $ | 204.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 204.8 |
Corporate debt securities | 0 to 1 years |  | 213.3 |  |  | — |  |  | (2.7) |  |  | 210.6 |  |  | 128.2 |  |  | — |  |  | (0.1) |  |  | 128.1 |
Securities of government-sponsored entities | 0 to 1 years |  | 199.8 |  |  | — |  |  | (3.2) |  |  | 196.6 |  |  | 37.6 |  |  | — |  |  | — |  |  | 37.6 |
|  |  | $ | 491.3 |  |  | $ | — |  |  | $ | (6.3) |  |  | $ | 485.0 |  |  | $ | 370.6 |  |  | $ | — |  |  | $ | (0.1) |  |  | $ | 370.5 |
Corporate debt securities | 1 to 3 years |  | $ | 266.8 |  |  | $ | — |  |  | $ | (5.6) |  |  | $ | 261.2 |  |  | $ | 358.9 |  |  | $ | — |  |  | $ | (1.5) |  |  | $ | 357.4 |
Securities of government-sponsored entities | 1 to 3 years |  | 148.7 |  |  | — |  |  | (4.7) |  |  | 144.0 |  |  | 204.3 |  |  | — |  |  | (1.0) |  |  | 203.3 |
|  |  | $ | 415.5 |  |  | $ | — |  |  | $ | (10.3) |  |  | $ | 405.2 |  |  | $ | 563.2 |  |  | $ | — |  |  | $ | (2.5) |  |  | $ | 560.7 |
Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position | The following table presents debt securities available-for-sale that were in an unrealized loss position as of June 30, 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 | $ | 61.0 |  |  | $ | (0.4) |  |  | $ | — |  |  | $ | — |  |  | $ | 61.0 |  |  | $ | (0.4) |
Corporate debt securities | $ | 403.8 |  |  | $ | (7.5) |  |  | $ | 60.8 |  |  | $ | (0.8) |  |  | $ | 464.6 |  |  | $ | (8.3) |
Securities of government-sponsored entities | $ | 329.1 |  |  | $ | (7.4) |  |  | $ | 11.5 |  |  | $ | (0.5) |  |  | $ | 340.6 |  |  | $ | (7.9) |
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) |

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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