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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 2,413.3 $ 2,750.1
Total 5,995.1  
Gross Unrealized Gains 54.9 22.1
Gross Unrealized Losses (14.6) (60.5)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 6,035.3  
Short- term Investments 1,818.4 2,473.1
Long- term Investments 4,079.8 2,120.0
Total assets measured at fair value, amortized cost 8,271.3 7,382.7
Total assets measured at fair value, fair value 8,311.5 7,343.2
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 566.8 526.2
Fair Value 566.8 526.2
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,846.5 2,223.9
Total 6,755.3 5,074.1
Gross Unrealized Gains 50.2 20.1
Gross Unrealized Losses (7.0) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 6,798.5 5,068.8
Short- term Investments 1,347.0 1,276.0
Long- term Investments 3,605.0 1,568.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,709.4 2,223.9
Fair Value 1,709.4 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 137.1 0.0
Total 5,045.9 2,850.2
Gross Unrealized Gains 50.2 20.1
Gross Unrealized Losses (7.0) (25.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 5,089.1 2,844.9
Short- term Investments 1,347.0 1,276.0
Long- term Investments 3,605.0 1,568.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 949.2 1,782.4
Gross Unrealized Gains 4.7 2.0
Gross Unrealized Losses (7.6) (35.1)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 946.2 1,748.2
Short- term Investments 471.4 1,197.1
Long- term Investments 474.8 551.1
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 393.7 1,300.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (5.1) (25.8)
Allowance for Credit Loss (0.1) (1.1)
Fair Value 388.5 1,273.5
Short- term Investments 294.5 974.6
Long- term Investments 94.0 298.9
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 540.7 402.6
Gross Unrealized Gains 4.7 2.0
Gross Unrealized Losses (2.4) (7.3)
Allowance for Credit Loss 0.0 0.0
Fair Value 543.0 397.3
Short- term Investments 163.6 149.5
Long- term Investments 379.4 247.8
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 14.8 79.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.1) (2.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 14.7 77.4
Short- term Investments 13.3 73.0
Long- term Investments $ 1.4 $ 4.4