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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 2,573.8 $ 2,027.4
Total 6,718.5  
Gross Unrealized Gains 32.2 14.8
Gross Unrealized Losses (13.5) (33.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 6,737.1  
Short- term Investments 1,937.5 1,985.9
Long- term Investments 4,589.9 4,819.1
Total assets measured at fair value, amortized cost 9,082.6 8,851.4
Total assets measured at fair value, fair value 9,101.2 8,832.4
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 577.3 479.4
Fair Value 577.3 479.4
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,996.5 1,548.0
Total 7,824.5 7,527.6
Gross Unrealized Gains 29.9 13.2
Gross Unrealized Losses (10.1) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 7,844.3 7,513.3
Short- term Investments 1,698.8 1,637.4
Long- term Investments 4,149.0 4,327.9
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 1,786.7 1,516.1
Fair Value 1,786.7 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 209.8 31.9
Total 6,037.8 6,011.5
Gross Unrealized Gains 29.9 13.2
Gross Unrealized Losses (10.1) (27.5)
Allowance for Credit Loss 0.0 0.0
Fair Value 6,057.6 5,997.2
Short- term Investments 1,698.8 1,637.4
Long- term Investments 4,149.0 4,327.9
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 680.8 844.4
Gross Unrealized Gains 2.3 1.6
Gross Unrealized Losses (3.4) (6.2)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 679.6 839.7
Short- term Investments 238.7 348.5
Long- term Investments 440.9 491.2
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 168.7 287.5
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (2.5) (3.7)
Allowance for Credit Loss (0.1) (0.1)
Fair Value 166.1 283.8
Short- term Investments 120.3 189.7
Long- term Investments 45.8 94.1
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 510.7 552.2
Gross Unrealized Gains 2.3 1.5
Gross Unrealized Losses (0.9) (2.4)
Allowance for Credit Loss 0.0 0.0
Fair Value 512.1 551.3
Short- term Investments 117.0 154.2
Long- term Investments 395.1 397.1
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