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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 | Mar. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | $ 798.0 | $ 735.8
Unrealized gain, current | 0.1 | 0.0
Unrealized loss, current | (7.3) | (9.4)
Fair value, current | 790.8 | 726.4
Amortized cost, noncurrent | 246.8 | 304.5
Unrealized gain, noncurrent | 0.6 | 0.2
Unrealized loss, noncurrent | (2.8) | (5.3)
Fair value, noncurrent | 244.6 | 299.4
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 211.3 | 156.2
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (0.1) | (0.2)
Fair value, current | 211.2 | 156.0
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 308.4 | 296.2
Unrealized gain, current | 0.0 | 0.0
Unrealized loss, current | (3.5) | (3.2)
Fair value, current | 304.9 | 293.0
Amortized cost, noncurrent | 208.1 | 259.5
Unrealized gain, noncurrent | 0.5 | 0.2
Unrealized loss, noncurrent | (2.1) | (4.3)
Fair value, noncurrent | 206.5 | 255.4
Securities of government-sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 278.3 | 283.4
Unrealized gain, current | 0.1 | 0.0
Unrealized loss, current | (3.7) | (6.0)
Fair value, current | 274.7 | 277.4
Amortized cost, noncurrent | 38.7 | 45.0
Unrealized gain, noncurrent | 0.1 | 0.0
Unrealized loss, noncurrent | (0.7) | (1.0)
Fair value, noncurrent | $ 38.1 | $ 44.0

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