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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Dec. 31, 2023 USD ($) security | Jun. 25, 2023 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 242.3 | $ 520.9
Greater than 12 Months | 384.4 | 463.1
Total | 626.7 | 984.0
Unrealized Loss |  |
Less than 12 Months | (0.3) | (1.6)
Greater than 12 Months | (12.0) | (21.1)
Total | $ (12.3) | $ (22.7)
Number of securities with an unrealized loss |  |
Less than 12 Months | security | 43 | 95
Greater than 12 Months | security | 192 | 234
Total | security | 235 | 329
Corporate bonds |  |
Fair Value |  |
Less than 12 Months | $ 47.6 | $ 151.5
Greater than 12 Months | 280.8 | 324.1
Total | 328.4 | 475.6
Unrealized Loss |  |
Less than 12 Months | (0.1) | (0.5)
Greater than 12 Months | (9.2) | (16.2)
Total | (9.3) | (16.7)
U.S. treasury securities |  |
Fair Value |  |
Less than 12 Months | 119.1 | 229.3
Greater than 12 Months | 19.6 | 31.1
Total | 138.7 | 260.4
Unrealized Loss |  |
Less than 12 Months | (0.1) | (0.5)
Greater than 12 Months | (0.3) | (0.9)
Total | (0.4) | (1.4)
Municipal bonds |  |
Fair Value |  |
Less than 12 Months | 17.1 | 61.4
Greater than 12 Months | 84.0 | 105.9
Total | 101.1 | 167.3
Unrealized Loss |  |
Less than 12 Months | (0.1) | (0.4)
Greater than 12 Months | (2.5) | (4.0)
Total | (2.6) | (4.4)
U.S. agency securities |  |
Fair Value |  |
Less than 12 Months | 58.5 | 74.8
Greater than 12 Months | 0.0 | 2.0
Total | 58.5 | 76.8
Unrealized Loss |  |
Less than 12 Months | 0.0 | (0.2)
Greater than 12 Months | 0.0 | 0.0
Total | $ 0.0 | (0.2)
Commercial paper |  |
Fair Value |  |
Less than 12 Months |  | 3.9
Greater than 12 Months |  | 0.0
Total |  | 3.9
Unrealized Loss |  |
Less than 12 Months |  | 0.0
Greater than 12 Months |  | 0.0
Total |  | $ 0.0

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