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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments [Abstract]  
Schedule of Available-for-Sale Debt Securities
Available-for-sale debt securities are recorded at fair value, with the portion of the unrealized gains and losses that are not credit-related included as a component of accumulated other comprehensive loss in stockholders’ equity, until realized. Available-for-sale debt securities consisted of the following (in millions):
As of September 30, 2023Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. government and agency securities$3,167.6 $— $(41.3)$3,126.3 
Corporate debt securities716.1 — (11.6)704.5 
Total(1)
$3,883.7 $— $(52.9)$3,830.8 
Reported under the following captions in our consolidated balance sheets:
Cash and cash equivalents$19.1 
Current marketable investments  1,750.9 
Non-current marketable investments  2,060.8 
Total(1)
  $3,830.8 
As of December 31, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. government and agency securities$2,697.8 $0.1 $(58.9)$2,639.0 
Corporate debt securities555.6 — (16.0)539.6 
Total(2)
$3,253.4 $0.1 $(74.9)$3,178.6 
Reported under the following captions in our consolidated balance sheets:
Cash and cash equivalents$15.6 
Current marketable investments  1,846.8 
Non-current marketable investments  1,316.2 
Total(2)
  $3,178.6 

(1)Total excludes $60.0 million related to available-for-sale debt securities that matured on September 30, 2023, although cash proceeds were not received until October 2, 2023. We recorded the $60.0 million receivable within other current assets in our consolidated balance sheets as of September 30, 2023.
(2)Total excludes $70.0 million related to available-for-sale debt securities that matured on December 31, 2022, although cash proceeds were not received until January 3, 2023. We recorded the $70.0 million receivable within other current assets in our consolidated balance sheets as of December 31, 2022.
Schedule of Available-for-Sale Debt Securities in an Unrealized Loss Position
The following tables present gross unrealized losses and fair value for those available-for-sale debt securities that were in an unrealized loss position as of September 30, 2023 and December 31, 2022, aggregated by investment category and length of time that the individual securities have been in a continuous loss position (in millions):

Less than 12 months12 months or longerTotal
As of September 30, 2023Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
U.S. government and agency securities$1,850.5 $(17.8)$1,139.8 $(23.5)$2,990.3 $(41.3)
Corporate debt securities349.1 (3.6)318.3 (8.0)667.4 (11.6)
Total$2,199.6 $(21.4)$1,458.1 $(31.5)$3,657.7 $(52.9)
Less than 12 months12 months or longerTotal
As of December 31, 2022Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
U.S. government and agency securities$1,324.6 $(24.2)$1,111.6 $(34.7)$2,436.2 $(58.9)
Corporate debt securities254.2 (6.7)274.1 (9.3)528.3 (16.0)
Total$1,578.8 $(30.9)$1,385.7 $(44.0)$2,964.5 $(74.9)
Schedule of the Contractual Maturities
The following table summarizes the contractual maturities of available-for-sale debt securities (in millions). Actual maturities may differ from contractual maturities because the issuers of certain of these debt securities have the right to call the securities or prepay their obligations under the securities with or without penalties.
 As of September 30, 2023
 Amortized CostFair Value
Due within one year$1,790.2 $1,770.0 
Due in one to three years2,093.5 2,060.8 
Total$3,883.7 $3,830.8