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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Summary of Cash and Available-For-Sale Securities
The following tables summarize the Company’s cash and available-for-sale debt securities’ amortized cost, gross unrealized gains, gross unrealized losses, allowance for credit loss, and fair value by significant investment category reported as cash and cash equivalents, short-term investments, or long-term investments as of December 31, 2023, and 2022 (in millions):
Reported as:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossFair
Value		Cash and
Cash
Equivalents		Short-term
Investments		Long-term
Investments
December 31, 2023
Cash$526.2 $— $— $— $526.2 $526.2 $— $— 
Level 1:
Money market funds2,223.9 — — — 2,223.9 2,223.9 — — 
U.S. treasuries2,850.2 20.1 (25.4)— 2,844.9 — 1,276.0 1,568.9 
Subtotal5,074.1 20.1 (25.4)— 5,068.8 2,223.9 1,276.0 1,568.9 
Level 2:
Corporate debt securities1,300.4 — (25.8)(1.1)1,273.5 — 974.6 298.9 
U.S. government agencies402.6 2.0 (7.3)— 397.3 — 149.5 247.8 
Municipal securities79.4 — (2.0)— 77.4 — 73.0 4.4 
Subtotal1,782.4 2.0 (35.1)(1.1)1,748.2 — 1,197.1 551.1 
Total assets measured at fair value$7,382.7 $22.1 $(60.5)$(1.1)$7,343.2 $2,750.1 $2,473.1 $2,120.0 
Reported as:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossFair
Value		Cash and
Cash
Equivalents		Short-term
Investments		Long-term
Investments
December 31, 2022
Cash$497.2 $— $— $— $497.2 $497.2 $— $— 
Level 1:
Money market funds1,084.0 — — — 1,084.0 1,084.0 — — 
U.S. treasuries2,715.2 — (96.6)— 2,618.6 — 1,542.4 1,076.2 
Subtotal3,799.2 — (96.6)— 3,702.6 1,084.0 1,542.4 1,076.2 
Level 2:
Commercial paper20.0 — — — 20.0 — 20.0 — 
Corporate debt securities2,022.0 — (76.0)(1.1)1,944.9 — 651.8 1,293.1 
U.S. government agencies447.2 — (19.9)— 427.3 — 247.8 179.5 
Municipal securities155.5 — (6.0)— 149.5 — 74.7 74.8 
Subtotal2,644.7 — (101.9)(1.1)2,541.7 — 994.3 1,547.4 
Total assets measured at fair value$6,941.1 $— $(198.5)$(1.1)$6,741.5 $1,581.2 $2,536.7 $2,623.6 
Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments
The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale debt securities (excluding money market funds), as of December 31, 2023 (in millions):
Amortized
Cost		Fair
Value
Mature in less than one year$2,512.5 $2,473.1 
Mature in one to five years2,120.1 2,120.0 
Total$4,632.6 $4,593.1 
Schedule Of Available-For-Sale Investments With Unrealized Losses
The following tables present the breakdown of the available-for-sale debt securities with unrealized losses as of December 31, 2023, and 2022 (in millions):
 Unrealized losses less
than 12 months		Unrealized losses 12
months or greater		Total
December 31, 2023Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
U.S. treasuries $48.5 $— $1,112.9 $(25.4)$1,161.4 $(25.4)
Corporate debt securities54.2 (0.1)1,219.2 (25.8)1,273.4 (25.9)
U.S. government agencies29.8 — 185.6 (7.3)215.4 (7.3)
Municipal securities— — 77.4 (1.9)77.4 (1.9)
Total$132.5 $(0.1)$2,595.1 $(60.4)$2,727.6 $(60.5)
December 31, 2022      
U.S. treasuries$731.7 $(26.0)$1,886.9 $(70.6)$2,618.6 $(96.6)
Corporate debt securities631.4 (17.6)1,221.9 (58.4)1,853.3 (76.0)
U.S. government agencies102.7 (4.4)324.6 (15.5)427.3 (19.9)
Municipal securities44.6 (1.1)104.9 (4.9)149.5 (6.0)
Total$1,510.4 $(49.1)$3,538.3 $(149.4)$5,048.7 $(198.5)
Debt Securities, Trading, and Equity Securities, FV-NI
The following table is a summary of the activity related to equity investments (in millions):
Reported as:
December 31, 2022
Carrying Value
Changes in Fair Value (1)
Purchases / Sales / Other (2)
December 31, 2023
Carrying Value
Prepaids and other current assetsIntangible and other assets, net
Equity investments with readily determinable value (Level 1)$4.3 $(0.4)$(3.9)$— $— $— 
Equity investments without readily determinable value (Level 2)$59.1 $(5.9)$21.3 $74.5 $— $74.5 
(1) Recorded in interest and other income, net.
(2) Other includes foreign currency translation gains/(losses).
Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures
These derivative instruments are used to hedge against balance sheet foreign currency exposures. The related gains and losses were as follows (in millions):
Years Ended December 31,
202320222021
Recognized gains in interest and other income, net$4.8 $26.9 $15.5 
Foreign exchange losses related to balance sheet re-measurement$(8.5)$(54.2)$(16.4)
Gross Notional Amounts for Outstanding Derivatives Total gross notional amounts (in USD) for outstanding derivatives and the aggregate gross fair value at the end of each period were as follows (in millions):
Derivatives Designated as Hedging InstrumentsDerivatives Not Designated as Hedging Instruments
December 31,
2023		December 31,
2022		December 31,
2023		December 31,
2022
Notional amounts:
Forward contracts$292.1 $188.4 $699.7 $496.3 
Gross fair value recorded in:
Prepaids and other current assets$3.1 $1.8 $5.0 $4.3 
Other accrued liabilities$5.9 $5.3 $6.6 $4.2