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Cash, Cash Equivalents and Short-Term Investments - Schedule of Breakdown of the Short-Term Investments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 months |  |
Fair Value | $ 17.2 | $ 43.5
Gross Unrealized Losses | 0.0 | (0.2)
More than 12 months |  |
Fair Value | 263.1 | 534.8
Gross Unrealized Losses | (8.5) | (21.1)
Total |  |
Fair Value | 280.3 | 578.3
Gross Unrealized Losses | (8.5) | (21.3)
Corporate notes and obligations |  |
Less than 12 months |  |
Fair Value | 6.2 | 25.1
Gross Unrealized Losses | 0.0 | (0.1)
More than 12 months |  |
Fair Value | 123.9 | 240.3
Gross Unrealized Losses | (4.1) | (10.2)
Total |  |
Fair Value | 130.1 | 265.4
Gross Unrealized Losses | (4.1) | (10.3)
U.S. Treasury securities |  |
Less than 12 months |  |
Fair Value | 4.8 | 17.8
Gross Unrealized Losses | 0.0 | (0.1)
More than 12 months |  |
Fair Value | 76.0 | 174.0
Gross Unrealized Losses | (2.8) | (6.0)
Total |  |
Fair Value | 80.8 | 191.8
Gross Unrealized Losses | (2.8) | (6.1)
Asset backed securities |  |
Less than 12 months |  |
Fair Value | 0.0 | 0.6
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 32.6 | 66.0
Gross Unrealized Losses | (0.6) | (2.3)
Total |  |
Fair Value | 32.6 | 66.6
Gross Unrealized Losses | (0.6) | (2.3)
Municipal securities |  |
Less than 12 months |  |
Fair Value | 6.2 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
More than 12 months |  |
Fair Value | 25.3 | 46.1
Gross Unrealized Losses | (0.7) | (2.0)
Total |  |
Fair Value | 31.5 | 46.1
Gross Unrealized Losses | (0.7) | (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 | 3.6 | 3.5
Gross Unrealized Losses | (0.2) | (0.3)
Total |  |
Fair Value | 3.6 | 3.5
Gross Unrealized Losses | (0.2) | (0.3)
Foreign government obligations |  |
Less than 12 months |  |
Fair Value |  | 0.0
Gross Unrealized Losses |  | 0.0
More than 12 months |  |
Fair Value |  | 3.3
Gross Unrealized Losses |  | (0.2)
Total |  |
Fair Value |  | 3.3
Gross Unrealized Losses |  | (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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