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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 2,806.6 $ 2,027.4
Total 5,963.6  
Gross Unrealized Gains 39.5 14.8
Gross Unrealized Losses (4.4) (33.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 5,998.6  
Short- term Investments 2,102.2 1,985.9
Long- term Investments 3,523.7 4,819.1
Total assets measured at fair value, amortized cost 8,397.5 8,851.4
Total assets measured at fair value, fair value 8,432.5 8,832.4
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 572.7 479.4
Fair Value 572.7 479.4
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,233.9 1,548.0
Total 7,371.3 7,527.6
Gross Unrealized Gains 37.1 13.2
Gross Unrealized Losses (3.0) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 7,405.4 7,513.3
Short- term Investments 1,923.0 1,637.4
Long- term Investments 3,248.5 4,327.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,861.2 1,516.1
Fair Value 1,861.2 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 372.7 31.9
Total 5,510.1 6,011.5
Gross Unrealized Gains 37.1 13.2
Gross Unrealized Losses (3.0) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 5,544.2 5,997.2
Short- term Investments 1,923.0 1,637.4
Long- term Investments 3,248.5 4,327.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 453.5 844.4
Gross Unrealized Gains 2.4 1.6
Gross Unrealized Losses (1.4) (6.2)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 454.4 839.7
Short- term Investments 179.2 348.5
Long- term Investments 275.2 491.2
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 89.2 287.5
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (1.2) (3.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 87.9 283.8
Short- term Investments 73.3 189.7
Long- term Investments 14.6 94.1
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 362.9 552.2
Gross Unrealized Gains 2.4 1.5
Gross Unrealized Losses (0.2) (2.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 365.1 551.3
Short- term Investments 104.5 154.2
Long- term Investments 260.6 397.1
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