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Available-for-Sale Debt Securities - Schedule of Fair Value of Available-For-Sale Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Current | $ 877.4 | $ 781.7
Unrealized Gain, Current | 1.6 | 0.3
Unrealized Loss, Current | (0.1) | (1.5)
Fair Value, Current | 878.9 | 780.5
Amortized Cost, Noncurrent | 637.1 | 684.6
Unrealized Gain, Noncurrent | 7.0 | 3.4
Unrealized Loss, Noncurrent | (0.2) | (0.5)
Fair Value, Noncurrent | 643.9 | 687.5
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Current | 37.3 | 53.5
Unrealized Gain, Current | 0.0 | 0.0
Unrealized Loss, Current | 0.0 | 0.0
Fair Value, Current | 37.3 | 53.5
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Current | 531.4 | 382.1
Unrealized Gain, Current | 1.0 | 0.1
Unrealized Loss, Current | (0.1) | (1.0)
Fair Value, Current | 532.3 | 381.2
Amortized Cost, Noncurrent | 488.9 | 483.5
Unrealized Gain, Noncurrent | 6.2 | 2.9
Unrealized Loss, Noncurrent | (0.1) | (0.4)
Fair Value, Noncurrent | 495.0 | 486.0
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost, Current | 308.7 | 346.1
Unrealized Gain, Current | 0.6 | 0.2
Unrealized Loss, Current | 0.0 | (0.5)
Fair Value, Current | 309.3 | 345.8
Amortized Cost, Noncurrent | 148.2 | 201.1
Unrealized Gain, Noncurrent | 0.8 | 0.5
Unrealized Loss, Noncurrent | (0.1) | (0.1)
Fair Value, Noncurrent | $ 148.9 | $ 201.5

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