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Investments (Tables)
 6 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
Short-term investments consisted of the following (in millions of U.S. Dollars):
 December 31, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$888.5 $1.3 ($0.4)$— $889.4 
Corporate bonds478.7 1.0 (9.3)— 470.4 
Municipal bonds137.9 0.2 (2.5)— 135.6 
Commercial paper90.1 — — — 90.1 
Certificates of deposit60.1 — — — 60.1 
U.S. agency securities58.5 — (0.1)— 58.4 
Variable rate demand notes27.3 — — — 27.3 
Total short-term investments$1,741.1 $2.5 ($12.3)$— $1,731.3 
 June 25, 2023
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
Corporate bonds$512.3 $— ($16.7)$— $495.6 
U.S. treasury securities261.8 — (1.4)— 260.4 
Municipal bonds179.7 — (4.4)— 175.3 
Certificates of deposit112.3 — — — 112.3 
U.S. agency securities77.0 — (0.2)— 76.8 
Commercial paper50.2 — — — 50.2 
Variable rate demand notes27.3 — — — 27.3 
Total short-term investments$1,220.6 $— ($22.7)$— $1,197.9 
Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time
The following tables present the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position (in millions of U.S. Dollars):
December 31, 2023
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$47.6 ($0.1)$280.8 ($9.2)$328.4 ($9.3)
U.S. treasury securities119.1 (0.1)19.6 (0.3)138.7 (0.4)
Municipal bonds17.1 (0.1)84.0 (2.5)101.1 (2.6)
U.S. agency securities58.5 — — — 58.5 — 
Total$242.3 ($0.3)$384.4 ($12.0)$626.7 ($12.3)
Number of securities with an unrealized loss43 192 235 
June 25, 2023
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$151.5 ($0.5)$324.1 ($16.2)$475.6 ($16.7)
U.S. treasury securities229.3 (0.5)31.1 (0.9)260.4 (1.4)
Municipal bonds61.4 (0.4)105.9 (4.0)167.3 (4.4)
U.S. agency securities74.8 (0.2)2.0 — 76.8 (0.2)
Commercial Paper3.9 — — — 3.9 — 
Total$520.9 ($1.6)$463.1 ($21.1)$984.0 ($22.7)
Number of securities with an unrealized loss95 234 329 
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments as of December 31, 2023 were as follows:

 
(in millions of U.S. Dollars)Within One YearAfter One, Within Five YearsAfter Five, Within Ten YearsAfter Ten YearsTotal
U.S. treasury securities$780.6 $108.8 $— $— $889.4 
Corporate bonds214.1 256.3 — — 470.4 
Municipal bonds57.8 75.4 — 2.4 135.6 
Commercial paper90.1 — — — 90.1 
Certificates of deposit60.1 — — — 60.1 
U.S. agency securities58.4 — — — 58.4 
Variable rate demand notes— — 10.7 16.6 27.3 
Total short-term investments$1,261.1 $440.5 $10.7 $19.0 $1,731.3