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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 3,602.0 $ 1,581.2
Total 4,179.9  
Gross Unrealized Gains 0.2 0.0
Gross Unrealized Losses (100.5) (198.5)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 4,078.5  
Short- term Investments 2,873.7 2,536.7
Long- term Investments 1,044.9 2,623.6
Total assets measured at fair value, amortized cost 7,622.0 6,941.1
Total assets measured at fair value, fair value 7,520.6 6,741.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 474.3 497.2
Fair Value 474.3 497.2
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 3,127.7 1,084.0
Total 5,292.0 3,799.2
Gross Unrealized Gains 0.2 0.0
Gross Unrealized Losses (43.9) (96.6)
Allowance for Credit Loss 0.0 0.0
Fair Value 5,248.3 3,702.6
Short- term Investments 1,660.5 1,542.4
Long- term Investments 460.1 1,076.2
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,967.8 1,084.0
Fair Value 2,967.8 1,084.0
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 159.9 0.0
Total 2,324.2 2,715.2
Gross Unrealized Gains 0.2 0.0
Gross Unrealized Losses (43.9) (96.6)
Allowance for Credit Loss 0.0 0.0
Fair Value 2,280.5 2,618.6
Short- term Investments 1,660.5 1,542.4
Long- term Investments 460.1 1,076.2
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,855.7 2,644.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (56.6) (101.9)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 1,798.0 2,541.7
Short- term Investments 1,213.2 994.3
Long- term Investments 584.8 1,547.4
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents   0.0
Total   20.0
Gross Unrealized Gains   0.0
Gross Unrealized Losses   0.0
Allowance for Credit Loss   0.0
Fair Value   20.0
Short- term Investments   20.0
Long- term Investments   0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,353.9 2,022.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (42.3) (76.0)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 1,310.5 1,944.9
Short- term Investments 914.7 651.8
Long- term Investments 395.8 1,293.1
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 400.4 447.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (11.2) (19.9)
Allowance for Credit Loss 0.0 0.0
Fair Value 389.2 427.3
Short- term Investments 214.2 247.8
Long- term Investments 175.0 179.5
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 101.4 155.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (3.1) (6.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 98.3 149.5
Short- term Investments 84.3 74.7
Long- term Investments $ 14.0 $ 74.8