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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 3,403.1 $ 2,027.4
Total 6,385.4  
Gross Unrealized Gains 37.1 14.8
Gross Unrealized Losses (8.7) (33.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 6,413.7  
Short- term Investments 1,923.4 1,985.9
Long- term Investments 4,206.0 4,819.1
Total assets measured at fair value, amortized cost 9,504.2 8,851.4
Total assets measured at fair value, fair value 9,532.5 8,832.4
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 528.0 479.4
Fair Value 528.0 479.4
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,875.1 1,548.0
Total 8,367.2 7,527.6
Gross Unrealized Gains 34.9 13.2
Gross Unrealized Losses (6.3) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 8,395.8 7,513.3
Short- term Investments 1,736.7 1,637.4
Long- term Investments 3,784.0 4,327.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,590.8 1,516.1
Fair Value 2,590.8 1,516.1
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 284.3 31.9
Total 5,776.4 6,011.5
Gross Unrealized Gains 34.9 13.2
Gross Unrealized Losses (6.3) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 5,805.0 5,997.2
Short- term Investments 1,736.7 1,637.4
Long- term Investments 3,784.0 4,327.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 609.0 844.4
Gross Unrealized Gains 2.2 1.6
Gross Unrealized Losses (2.4) (6.2)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 608.7 839.7
Short- term Investments 186.7 348.5
Long- term Investments 422.0 491.2
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 124.8 287.5
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (1.9) (3.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 122.8 283.8
Short- term Investments 97.5 189.7
Long- term Investments 25.3 94.1
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 482.8 552.2
Gross Unrealized Gains 2.2 1.5
Gross Unrealized Losses (0.5) (2.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 484.5 551.3
Short- term Investments 87.8 154.2
Long- term Investments 396.7 397.1
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1.4 4.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 (0.1)
Allowance for Credit Loss 0.0 0.0
Fair Value 1.4 4.6
Short- term Investments 1.4 4.6
Long- term Investments $ 0.0 $ 0.0