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Available-for-Sale Debt Securities (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Fair Value of Available-For-Sale Debt Securities | The following table presents a summary of available-for-sale debt securities, aggregated by major security type and contractual maturity.
|  |  | September 30, 2024 |  | December 31, 2023
(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 |  | $ | 37.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 37.3 |  |  | $ | 53.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 53.5 |
Corporate debt securities | 0 to 1 years |  | 531.4 |  |  | 1.0 |  |  | (0.1) |  |  | 532.3 |  |  | 382.1 |  |  | 0.1 |  |  | (1.0) |  |  | 381.2 |
Securities of government-sponsored entities | 0 to 1 years |  | 308.7 |  |  | 0.6 |  |  | — |  |  | 309.3 |  |  | 346.1 |  |  | 0.2 |  |  | (0.5) |  |  | 345.8 |
|  |  | $ | 877.4 |  |  | $ | 1.6 |  |  | $ | (0.1) |  |  | $ | 878.9 |  |  | $ | 781.7 |  |  | $ | 0.3 |  |  | $ | (1.5) |  |  | $ | 780.5 |
Corporate debt securities | 1 to 3 years |  | $ | 488.9 |  |  | $ | 6.2 |  |  | $ | (0.1) |  |  | $ | 495.0 |  |  | $ | 483.5 |  |  | $ | 2.9 |  |  | $ | (0.4) |  |  | $ | 486.0 |
Securities of government-sponsored entities | 1 to 3 years |  | 148.2 |  |  | 0.8 |  |  | (0.1) |  |  | 148.9 |  |  | 201.1 |  |  | 0.5 |  |  | (0.1) |  |  | 201.5 |
|  |  | $ | 637.1 |  |  | $ | 7.0 |  |  | $ | (0.2) |  |  | $ | 643.9 |  |  | $ | 684.6 |  |  | $ | 3.4 |  |  | $ | (0.5) |  |  | $ | 687.5 |
Schedule of Gross Unrealized Losses and Fair Value Available-For-Sale Investments in Unrealized Loss Position | The following table presents available-for-sale debt securities that were in an unrealized loss position as of September 30, 2024, 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 | $ | 125.9 |  |  | $ | (0.1) |  |  | $ | 49.1 |  |  | $ | (0.1) |  |  | $ | 175.0 |  |  | $ | (0.2) |
Securities of government-sponsored entities | $ | 84.8 |  |  | $ | (0.1) |  |  | $ | — |  |  | $ | — |  |  | $ | 84.8 |  |  | $ | (0.1) |
The following table presents available-for-sale debt securities that were in an unrealized loss position as of December 31, 2023, 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 | $ | 265.1 |  |  | $ | (0.4) |  |  | $ | 183.8 |  |  | $ | (1.0) |  |  | $ | 448.9 |  |  | $ | (1.4) |
Securities of government-sponsored entities | $ | 214.6 |  |  | $ | (0.2) |  |  | $ | 16.7 |  |  | $ | (0.4) |  |  | $ | 231.3 |  |  | $ | (0.6) |

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