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FINANCIAL INSTRUMENTS - Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value $ 3,542.6 $ 4,856.7
Unrealized losses less than 12 months, gross unrealized losses (127.9) (31.2)
Unrealized losses more than 12 months, fair value 2,032.3 0.0
Unrealized losses more than 12 months, gross unrealized losses (100.8) 0.0
Total unrealized losses, fair value 5,574.9 4,856.7
Total unrealized losses, gross unrealized losses (228.7) (31.2)
U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 1,811.4 2,596.3
Unrealized losses less than 12 months, gross unrealized losses (60.4) (15.4)
Unrealized losses more than 12 months, fair value 1,124.5 0.0
Unrealized losses more than 12 months, gross unrealized losses (52.6) 0.0
Total unrealized losses, fair value 2,935.9 2,596.3
Total unrealized losses, gross unrealized losses (113.0) (15.4)
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value   4.0
Unrealized losses less than 12 months, gross unrealized losses   0.0
Unrealized losses more than 12 months, fair value   0.0
Unrealized losses more than 12 months, gross unrealized losses   0.0
Total unrealized losses, fair value   4.0
Total unrealized losses, gross unrealized losses   0.0
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 1,401.9 1,687.9
Unrealized losses less than 12 months, gross unrealized losses (55.0) (11.9)
Unrealized losses more than 12 months, fair value 599.4 0.0
Unrealized losses more than 12 months, gross unrealized losses (32.2) 0.0
Total unrealized losses, fair value 2,001.3 1,687.9
Total unrealized losses, gross unrealized losses (87.2) (11.9)
U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 220.0 412.5
Unrealized losses less than 12 months, gross unrealized losses (8.4) (2.9)
Unrealized losses more than 12 months, fair value 257.4 0.0
Unrealized losses more than 12 months, gross unrealized losses (13.4) 0.0
Total unrealized losses, fair value 477.4 412.5
Total unrealized losses, gross unrealized losses (21.8) (2.9)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Unrealized losses less than 12 months, fair value 109.3 156.0
Unrealized losses less than 12 months, gross unrealized losses (4.1) (1.0)
Unrealized losses more than 12 months, fair value 51.0 0.0
Unrealized losses more than 12 months, gross unrealized losses (2.6) 0.0
Total unrealized losses, fair value 160.3 156.0
Total unrealized losses, gross unrealized losses $ (6.7) $ (1.0)