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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 3,036.7 $ 2,750.1
Total 4,700.9  
Gross Unrealized Gains 4.2 22.1
Gross Unrealized Losses (40.9) (60.5)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 4,664.1  
Short- term Investments 1,720.5 2,473.1
Long- term Investments 2,925.9 2,120.0
Total assets measured at fair value, amortized cost 7,719.9 7,382.7
Total assets measured at fair value, fair value 7,683.1 7,343.2
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 475.2 526.2
Fair Value 475.2 526.2
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,561.5 2,223.9
Total 6,082.3 5,074.1
Gross Unrealized Gains 3.7 20.1
Gross Unrealized Losses (23.7) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 6,062.3 5,068.8
Short- term Investments 995.1 1,276.0
Long- term Investments 2,505.7 1,568.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,543.8 2,223.9
Fair Value 2,543.8 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 17.7 0.0
Total 3,538.5 2,850.2
Gross Unrealized Gains 3.7 20.1
Gross Unrealized Losses (23.7) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 3,518.5 2,844.9
Short- term Investments 995.1 1,276.0
Long- term Investments 2,505.7 1,568.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,162.4 1,782.4
Gross Unrealized Gains 0.5 2.0
Gross Unrealized Losses (17.2) (35.1)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 1,145.6 1,748.2
Short- term Investments 725.4 1,197.1
Long- term Investments 420.2 551.1
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 625.6 1,300.4
Gross Unrealized Gains 0.1 0.0
Gross Unrealized Losses (11.5) (25.8)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 614.1 1,273.5
Short- term Investments 472.3 974.6
Long- term Investments 141.8 298.9
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 476.0 402.6
Gross Unrealized Gains 0.4 2.0
Gross Unrealized Losses (5.2) (7.3)
Allowance for Credit Loss 0.0 0.0
Fair Value 471.2 397.3
Short- term Investments 194.1 149.5
Long- term Investments 277.1 247.8
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 60.8 79.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.5) (2.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 60.3 77.4
Short- term Investments 59.0 73.0
Long- term Investments $ 1.3 $ 4.4