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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value $ 5,412.8 $ 4,856.7
Unrealized losses less than 12 months, gross unrealized losses (153.3) (31.2)
Unrealized losses more than 12 months, fair value 567.3 0.0
Unrealized losses more than 12 months, gross unrealized losses (27.4) 0.0
Total unrealized losses, fair value 5,980.1 4,856.7
Total unrealized losses, gross unrealized losses (180.7) (31.2)
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 2,882.3 2,596.3
Unrealized losses less than 12 months, gross unrealized losses (74.6) (15.4)
Unrealized losses more than 12 months, fair value 327.0 0.0
Unrealized losses more than 12 months, gross unrealized losses (15.0) 0.0
Total unrealized losses, fair value 3,209.3 2,596.3
Total unrealized losses, gross unrealized losses (89.6) (15.4)
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 3.0 4.0
Unrealized losses less than 12 months, gross unrealized losses 0.0 0.0
Unrealized losses more than 12 months, fair value 0.0 0.0
Unrealized losses more than 12 months, gross unrealized losses 0.0 0.0
Total unrealized losses, fair value 3.0 4.0
Total unrealized losses, gross unrealized losses 0.0 0.0
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 1,917.7 1,687.9
Unrealized losses less than 12 months, gross unrealized losses (59.5) (11.9)
Unrealized losses more than 12 months, fair value 182.3 0.0
Unrealized losses more than 12 months, gross unrealized losses (9.6) 0.0
Total unrealized losses, fair value 2,100.0 1,687.9
Total unrealized losses, gross unrealized losses (69.1) (11.9)
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 479.8 412.5
Unrealized losses less than 12 months, gross unrealized losses (15.7) (2.9)
Unrealized losses more than 12 months, fair value 16.5 0.0
Unrealized losses more than 12 months, gross unrealized losses (1.0) 0.0
Total unrealized losses, fair value 496.3 412.5
Total unrealized losses, gross unrealized losses (16.7) (2.9)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 130.0 156.0
Unrealized losses less than 12 months, gross unrealized losses (3.5) (1.0)
Unrealized losses more than 12 months, fair value 41.5 0.0
Unrealized losses more than 12 months, gross unrealized losses (1.8) 0.0
Total unrealized losses, fair value 171.5 156.0
Total unrealized losses, gross unrealized losses $ (5.3) $ (1.0)