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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 | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | $ 595.6 | $ 370.6
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (8.4) | (0.1)
Fair value, current | 587.2 | 370.5
Amortized cost, noncurrent | 373.1 | 563.2
Unrealized gain, noncurrent | 0.0 | 0.0
Unrealized loss, noncurrent | (10.5) | (2.5)
Fair value, noncurrent | 362.6 | 560.7
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 97.9 | 204.8
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (0.4) | 0.0
Fair value, current | 97.5 | 204.8
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 260.5 | 128.2
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (3.2) | (0.1)
Fair value, current | 257.3 | 128.1
Amortized cost, noncurrent | 270.8 | 358.9
Unrealized gain, noncurrent | 0.0 | 0.0
Unrealized loss, noncurrent | (6.2) | (1.5)
Fair value, noncurrent | 264.6 | 357.4
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 237.2 | 37.6
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (4.8) | 0.0
Fair value, current | 232.4 | 37.6
Amortized cost, noncurrent | 102.3 | 204.3
Unrealized gain, noncurrent | 0.0 | 0.0
Unrealized loss, noncurrent | (4.3) | (1.0)
Fair value, noncurrent | $ 98.0 | $ 203.3

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