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Investments - Short-term Investments by Type (Details) - USD ($)
Dec. 31, 2023
Jun. 25, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 1,741,100,000 $ 1,220,600,000
Gross Unrealized Gains 2,500,000 0
Gross Unrealized Losses (12,300,000) (22,700,000)
Credit Loss Allowance 0 0
Estimated Fair Value 1,731,300,000 1,197,900,000
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 888,500,000 261,800,000
Gross Unrealized Gains 1,300,000 0
Gross Unrealized Losses (400,000) (1,400,000)
Credit Loss Allowance 0 0
Estimated Fair Value 889,400,000 260,400,000
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 478,700,000 512,300,000
Gross Unrealized Gains 1,000,000.0 0
Gross Unrealized Losses (9,300,000) (16,700,000)
Credit Loss Allowance 0 0
Estimated Fair Value 470,400,000 495,600,000
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 137,900,000 179,700,000
Gross Unrealized Gains 200,000 0
Gross Unrealized Losses (2,500,000) (4,400,000)
Credit Loss Allowance 0 0
Estimated Fair Value 135,600,000 175,300,000
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 90,100,000 50,200,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Credit Loss Allowance 0 0
Estimated Fair Value 90,100,000 50,200,000
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 60,100,000 112,300,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Credit Loss Allowance 0 0
Estimated Fair Value 60,100,000 112,300,000
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 58,500,000 77,000,000.0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (100,000) (200,000)
Credit Loss Allowance 0 0
Estimated Fair Value 58,400,000 76,800,000
Variable rate demand notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 27,300,000 27,300,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Credit Loss Allowance 0 0
Estimated Fair Value $ 27,300,000 $ 27,300,000