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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 2,839.5 $ 2,750.1
Total 4,604.8  
Gross Unrealized Gains 7.0 22.1
Gross Unrealized Losses (50.8) (60.5)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 4,559.9  
Short- term Investments 1,960.6 2,473.1
Long- term Investments 2,522.6 2,120.0
Total assets measured at fair value, amortized cost 7,367.6 7,382.7
Total assets measured at fair value, fair value 7,322.7 7,343.2
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 608.9 526.2
Fair Value 608.9 526.2
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,230.6 2,223.9
Total 5,318.6 5,074.1
Gross Unrealized Gains 6.3 20.1
Gross Unrealized Losses (25.5) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 5,299.4 5,068.8
Short- term Investments 962.5 1,276.0
Long- term Investments 2,106.3 1,568.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,153.9 2,223.9
Fair Value 2,153.9 2,223.9
Short- term Investments 0.0 0.0
Long- term Investments 0.0 0.0
Level 1 | U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 76.7 0.0
Total 3,164.7 2,850.2
Gross Unrealized Gains 6.3 20.1
Gross Unrealized Losses (25.5) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,145.5 2,844.9
Short- term Investments 962.5 1,276.0
Long- term Investments 2,106.3 1,568.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,440.1 1,782.4
Gross Unrealized Gains 0.7 2.0
Gross Unrealized Losses (25.3) (35.1)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 1,414.4 1,748.2
Short- term Investments 998.1 1,197.1
Long- term Investments 416.3 551.1
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 938.5 1,300.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (17.6) (25.8)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 919.8 1,273.5
Short- term Investments 731.2 974.6
Long- term Investments 188.6 298.9
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 431.0 402.6
Gross Unrealized Gains 0.7 2.0
Gross Unrealized Losses (6.5) (7.3)
Allowance for Credit Loss 0.0 0.0
Fair Value 425.2 397.3
Short- term Investments 198.8 149.5
Long- term Investments 226.4 247.8
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 70.6 79.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (1.2) (2.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 69.4 77.4
Short- term Investments 68.1 73.0
Long- term Investments $ 1.3 $ 4.4