v3.26.1
FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value $ 3,337.1 $ 342.5
Unrealized losses less than 12 months, gross unrealized losses (21.0) (0.3)
Unrealized losses more than 12 months, fair value 142.1 267.2
Unrealized losses more than 12 months, gross unrealized losses (0.5) (1.4)
Total unrealized losses, fair value 3,479.2 609.7
Total unrealized losses, gross unrealized losses (21.5) (1.7)
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 2,777.5 298.0
Unrealized losses less than 12 months, gross unrealized losses (15.0) (0.3)
Unrealized losses more than 12 months, fair value 111.2 164.4
Unrealized losses more than 12 months, gross unrealized losses (0.2) (0.6)
Total unrealized losses, fair value 2,888.7 462.4
Total unrealized losses, gross unrealized losses (15.2) (0.9)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 467.3 44.5
Unrealized losses less than 12 months, gross unrealized losses (5.7) 0.0
Unrealized losses more than 12 months, fair value 25.9 73.6
Unrealized losses more than 12 months, gross unrealized losses (0.3) (0.7)
Total unrealized losses, fair value 493.2 118.1
Total unrealized losses, gross unrealized losses (6.0) (0.7)
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 92.3 0.0
Unrealized losses less than 12 months, gross unrealized losses (0.3) 0.0
Unrealized losses more than 12 months, fair value 5.0 29.2
Unrealized losses more than 12 months, gross unrealized losses 0.0 (0.1)
Total unrealized losses, fair value 97.3 29.2
Total unrealized losses, gross unrealized losses $ (0.3) $ (0.1)