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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents $ 2,750.1 $ 1,581.2
Total 4,632.6  
Total assets measured at fair value, Amortized Cost 7,382.7 6,941.1
Gross Unrealized Gains 22.1 0.0
Gross Unrealized Losses (60.5) (198.5)
Allowance for Credit Loss (1.1) (1.1)
Total 4,593.1  
Total assets measured at fair value, Fair Value 7,343.2 6,741.5
Short-term Investments 2,473.1 2,536.7
Long-term Investments 2,120.0 2,623.6
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 526.2 497.2
Fair Value 526.2 497.2
Level 1:    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 2,223.9 1,084.0
Total 5,074.1 3,799.2
Gross Unrealized Gains 20.1 0.0
Gross Unrealized Losses (25.4) (96.6)
Allowance for Credit Loss 0.0 0.0
Total 5,068.8 3,702.6
Short-term Investments 1,276.0 1,542.4
Long-term Investments 1,568.9 1,076.2
Level 1: | Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 2,223.9 1,084.0
Fair Value 2,223.9 1,084.0
Short-term Investments 0.0 0.0
Long-term Investments 0.0 0.0
Level 1: | U.S. treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 2,850.2 2,715.2
Gross Unrealized Gains 20.1 0.0
Gross Unrealized Losses (25.4) (96.6)
Allowance for Credit Loss 0.0 0.0
Total 2,844.9 2,618.6
Short-term Investments 1,276.0 1,542.4
Long-term Investments 1,568.9 1,076.2
Fair Value, Inputs, Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 1,782.4 2,644.7
Gross Unrealized Gains 2.0 0.0
Gross Unrealized Losses (35.1) (101.9)
Allowance for Credit Loss (1.1) (1.1)
Total 1,748.2 2,541.7
Short-term Investments 1,197.1 994.3
Long-term Investments 551.1 1,547.4
Fair Value, Inputs, Level 2 | Commercial paper    
Schedule of Available-for-sale Securities [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
Total   20.0
Short-term Investments   20.0
Long-term Investments   0.0
Fair Value, Inputs, Level 2 | Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 1,300.4 2,022.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (25.8) (76.0)
Allowance for Credit Loss (1.1) (1.1)
Total 1,273.5 1,944.9
Short-term Investments 974.6 651.8
Long-term Investments 298.9 1,293.1
Fair Value, Inputs, Level 2 | U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 402.6 447.2
Gross Unrealized Gains 2.0 0.0
Gross Unrealized Losses (7.3) (19.9)
Allowance for Credit Loss 0.0 0.0
Total 397.3 427.3
Short-term Investments 149.5 247.8
Long-term Investments 247.8 179.5
Fair Value, Inputs, Level 2 | Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 79.4 155.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (2.0) (6.0)
Allowance for Credit Loss 0.0 0.0
Total 77.4 149.5
Short-term Investments 73.0 74.7
Long-term Investments $ 4.4 $ 74.8