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Cash, Cash Equivalents and Short-Term Investments - Schedule of Breakdown of the Short-Term Investments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 months |  |
Fair Value | $ 114.6 | $ 43.5
Gross Unrealized Losses | (0.5) | (0.2)
More than 12 months |  |
Fair Value | 350.0 | 534.8
Gross Unrealized Losses | (15.3) | (21.1)
Total |  |
Fair Value | 464.6 | 578.3
Gross Unrealized Losses | (15.8) | (21.3)
Corporate notes and obligations |  |
Less than 12 months |  |
Fair Value | 77.6 | 25.1
Gross Unrealized Losses | (0.3) | (0.1)
More than 12 months |  |
Fair Value | 168.4 | 240.3
Gross Unrealized Losses | (7.4) | (10.2)
Total |  |
Fair Value | 246.0 | 265.4
Gross Unrealized Losses | (7.7) | (10.3)
U.S. Treasury securities |  |
Less than 12 months |  |
Fair Value | 33.9 | 17.8
Gross Unrealized Losses | (0.2) | (0.1)
More than 12 months |  |
Fair Value | 92.2 | 174.0
Gross Unrealized Losses | (4.8) | (6.0)
Total |  |
Fair Value | 126.1 | 191.8
Gross Unrealized Losses | (5.0) | (6.1)
Asset backed securities |  |
Less than 12 months |  |
Fair Value | 3.1 | 0.6
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 46.0 | 66.0
Gross Unrealized Losses | (1.2) | (2.3)
Total |  |
Fair Value | 49.1 | 66.6
Gross Unrealized Losses | (1.2) | (2.3)
Municipal securities |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 36.3 | 46.1
Gross Unrealized Losses | (1.4) | (2.0)
Total |  |
Fair Value | 36.3 | 46.1
Gross Unrealized Losses | (1.4) | (2.0)
U.S. agency obligations |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 3.5 | 3.5
Gross Unrealized Losses | (0.3) | (0.3)
Total |  |
Fair Value | 3.5 | 3.5
Gross Unrealized Losses | (0.3) | (0.3)
Foreign government obligations |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 1.9 | 3.3
Gross Unrealized Losses | (0.1) | (0.2)
Total |  |
Fair Value | 1.9 | 3.3
Gross Unrealized Losses | (0.1) | (0.2)
Supranational securities |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 1.7 | 1.6
Gross Unrealized Losses | (0.1) | (0.1)
Total |  |
Fair Value | 1.7 | 1.6
Gross Unrealized Losses | $ (0.1) | $ (0.1)

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