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Cash Equivalents and Investments (Tables)
 3 Months Ended
Mar. 31, 2025
Cash Equivalents and Investments [Abstract]  
Schedule of Unrealized Gains and Losses and Fair Value of Available-For-Sale Debt Securities
The following table summarizes the Company's unrealized gains and losses and fair value of investments designated as available-for-sale debt securities as of March 31, 2025 and December 31, 2024 (in millions):

As of March 31, 2025
As of December 31, 2024
Amortized
Cost		Gross Unrealized
Gains
Gross Unrealized and Credit
Losses
Estimated Fair
Value		Amortized
Cost		Gross Unrealized
Gains
Gross Unrealized and Credit
Losses
Estimated Fair
Value
Fixed income securities:
Asset-backed and mortgage-backed securities$151.7 $0.6 $(0.2)$152.1 $106.6 $0.4 $(0.5)$106.5 
Corporate debt securities341.5 1.2 (0.2)342.5 308.8 0.9 (0.3)309.4 
Certificates of deposit20.4 — — 20.4 6.8 — — 6.8 
Commercial paper97.4 — — 97.4 77.2 — — 77.2 
Time deposits8.6 — — 8.6 202.2 — — 202.2 
U.S. government agency securities
14.9 — — 14.9 6.0 — — 6.0 
U.S. government securities103.2 0.2 — 103.4 99.2 0.1 — 99.3 
Total fixed income securities
737.7 2.0 (0.4)739.3 806.8 1.4 (0.8)807.4 
Privately-held debt and redeemable preferred stock securities46.3 — (15.4)30.9 45.8 — (15.4)30.4 
Total available-for-sale debt securities
$784.0 $2.0 $(15.8)$770.2 $852.6 $1.4 $(16.2)$837.8 
Reported as:
Cash equivalents$69.0 $— $— $69.0 $273.9 $— $— $273.9 
Short-term investments257.8 0.2 — 258.0 147.9 0.2 — 148.1 
Long-term investments410.9 1.8 (0.4)412.3 385.0 1.2 (0.8)385.4 
Other long-term assets46.3 — (15.4)30.9 45.8 — (15.4)30.4 
Total$784.0 $2.0 $(15.8)$770.2 $852.6 $1.4 $(16.2)$837.8 
Schedule of Maturities of Fixed Income Securities
The following table presents the contractual maturities of the Company's total fixed income securities as of March 31, 2025 (in millions):
 Amortized
Cost		Estimated Fair
Value
Due in less than one year$326.8 $327.0 
Due between one and five years410.9 412.3 
Total$737.7 $739.3 
Schedule of Investments in Equity Securities
The following table presents the Company's investments in equity securities as of March 31, 2025 and December 31, 2024 (in millions):
As of
March 31,
2025		December 31,
2024
Equity investments with readily determinable fair value:
Money market funds$677.8 $562.6 
Mutual funds48.5 49.1 
Publicly-traded equity securities10.6 12.2 
Equity investments without readily determinable fair value53.0 53.8 
Total equity securities$789.9 $677.7 
Reported as:
Cash equivalents$677.8 $562.6 
Short-term investments10.6 12.2 
Prepaid expenses and other current assets3.6 3.5 
Other long-term assets97.9 99.4 
Total$789.9 $677.7 
Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash included in the Condensed Consolidated Balance Sheets as of March 31, 2025 and December 31, 2024 (in millions):
As of
March 31,
2025		December 31,
2024
Cash and cash equivalents$1,289.4 $1,224.3 
Restricted cash included in Prepaid expenses and other current assets
8.2 9.2 
Restricted cash included in Other long-term assets
2.4 2.3 
Total cash, cash equivalents, and restricted cash$1,300.0 $1,235.8