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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 3,435.4 $ 1,581.2
Total 3,830.7  
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (133.3) (198.5)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 3,696.3  
Short- term Investments 2,363.8 2,536.7
Long- term Investments 1,332.5 2,623.6
Total assets measured at fair value, amortized cost 7,266.1 6,941.1
Total assets measured at fair value, fair value 7,131.7 6,741.5
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 520.3 497.2
Fair Value 520.3 497.2
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,915.1 1,084.0
Total 4,775.9 3,799.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (61.0) (96.6)
Allowance for Credit Loss 0.0 0.0
Fair Value 4,714.9 3,702.6
Short- term Investments 1,294.2 1,542.4
Long- term Investments 505.6 1,076.2
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 2,915.1 1,084.0
Fair Value 2,915.1 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 0.0 0.0
Total 1,860.8 2,715.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (61.0) (96.6)
Allowance for Credit Loss 0.0 0.0
Fair Value 1,799.8 2,618.6
Short- term Investments 1,294.2 1,542.4
Long- term Investments 505.6 1,076.2
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,969.9 2,644.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (72.3) (101.9)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 1,896.5 2,541.7
Short- term Investments 1,069.6 994.3
Long- term Investments 826.9 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 1,490.5 2,022.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (53.9) (76.0)
Allowance for Credit Loss (1.1) (1.1)
Fair Value 1,435.5 1,944.9
Short- term Investments 829.5 651.8
Long- term Investments 606.0 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 361.2 447.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (14.3) (19.9)
Allowance for Credit Loss 0.0 0.0
Fair Value 346.9 427.3
Short- term Investments 183.8 247.8
Long- term Investments 163.1 179.5
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 118.2 155.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (4.1) (6.0)
Allowance for Credit Loss 0.0 0.0
Fair Value 114.1 149.5
Short- term Investments 56.3 74.7
Long- term Investments $ 57.8 $ 74.8