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Debt Securities - Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Debt Securities Available-For-Sale (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | $ 735.8 | $ 370.6
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (9.4) | (0.1)
Fair value, current | 726.4 | 370.5
Amortized cost, noncurrent | 304.5 | 563.2
Unrealized gain, noncurrent | 0.2 | 0.0
Unrealized loss, noncurrent | (5.3) | (2.5)
Fair value, noncurrent | 299.4 | 560.7
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 156.2 | 204.8
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (0.2) | 0.0
Fair value, current | 156.0 | 204.8
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 296.2 | 128.2
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (3.2) | (0.1)
Fair value, current | 293.0 | 128.1
Amortized cost, noncurrent | 259.5 | 358.9
Unrealized gain, noncurrent | 0.2 | 0.0
Unrealized loss, noncurrent | (4.3) | (1.5)
Fair value, noncurrent | 255.4 | 357.4
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 283.4 | 37.6
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (6.0) | 0.0
Fair value, current | 277.4 | 37.6
Amortized cost, noncurrent | 45.0 | 204.3
Unrealized gain, noncurrent | 0.0 | 0.0
Unrealized loss, noncurrent | (1.0) | (1.0)
Fair value, noncurrent | $ 44.0 | $ 203.3

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