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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value $ 1,914.6 $ 132.5
Unrealized losses less than 12 months, gross unrealized losses (12.4) (0.1)
Unrealized losses more than 12 months, fair value 1,285.9 2,595.1
Unrealized losses more than 12 months, gross unrealized losses (28.5) (60.4)
Total unrealized losses, fair value 3,200.5 2,727.6
Total unrealized losses, gross unrealized losses (40.9) (60.5)
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 1,736.5 48.5
Unrealized losses less than 12 months, gross unrealized losses (11.8) 0.0
Unrealized losses more than 12 months, fair value 526.4 1,112.9
Unrealized losses more than 12 months, gross unrealized losses (11.9) (25.4)
Total unrealized losses, fair value 2,262.9 1,161.4
Total unrealized losses, gross unrealized losses (23.7) (25.4)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 42.9 54.2
Unrealized losses less than 12 months, gross unrealized losses 0.0 (0.1)
Unrealized losses more than 12 months, fair value 529.2 1,219.2
Unrealized losses more than 12 months, gross unrealized losses (11.5) (25.8)
Total unrealized losses, fair value 572.1 1,273.4
Total unrealized losses, gross unrealized losses (11.5) (25.9)
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 135.2 29.8
Unrealized losses less than 12 months, gross unrealized losses (0.6) 0.0
Unrealized losses more than 12 months, fair value 170.0 185.6
Unrealized losses more than 12 months, gross unrealized losses (4.6) (7.3)
Total unrealized losses, fair value 305.2 215.4
Total unrealized losses, gross unrealized losses (5.2) (7.3)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 0.0 0.0
Unrealized losses less than 12 months, gross unrealized losses 0.0 0.0
Unrealized losses more than 12 months, fair value 60.3 77.4
Unrealized losses more than 12 months, gross unrealized losses (0.5) (1.9)
Total unrealized losses, fair value 60.3 77.4
Total unrealized losses, gross unrealized losses $ (0.5) $ (1.9)