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Cash Equivalents and Investments (Tables)
 12 Months Ended
Dec. 31, 2024
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 December 31, 2024 and December 31, 2023 (in millions):
As of December 31, 2024
As of December 31, 2023
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$106.6 $0.4 $(0.5)$106.5 $38.2 $0.2 $(0.4)$38.0 
Certificates of deposit6.8 — — 6.8 3.0 — — 3.0 
Commercial paper77.2 — — 77.2 41.1 — — 41.1 
Corporate debt securities308.8 0.9 (0.3)309.4 160.2 0.7 (1.3)159.6 
Foreign government debt securities
— — — — 5.3 — (0.2)5.1 
Time deposits202.2 — — 202.2 273.6 — — 273.6 
U.S. government agency securities
6.0 — — 6.0 4.0 — — 4.0 
U.S. government securities99.2 0.1 — 99.3 54.8 0.1 — 54.9 
Total fixed income securities
806.8 1.4 (0.8)807.4 580.2 1.0 (1.9)579.3 
Privately-held debt and redeemable preferred stock securities
45.8 — (15.4)30.4 20.6 37.4 (8.3)49.7 
Total available-for-sale debt securities
$852.6 $1.4 $(16.2)$837.8 $600.8 $38.4 $(10.2)$629.0 
Reported as:
Cash equivalents$273.9 $— $— $273.9 $328.2 $— $— $328.2 
Short-term investments147.9 0.2 — 148.1 135.7 — (1.4)134.3 
Long-term investments385.0 1.2 (0.8)385.4 116.3 1.0 (0.5)116.8 
Other long-term assets45.8 — (15.4)30.4 20.6 37.4 (8.3)49.7 
Total$852.6 $1.4 $(16.2)$837.8 $600.8 $38.4 $(10.2)$629.0 
Schedule of Maturities of Fixed Income Securities
The following table presents the contractual maturities of the Company's total fixed income securities as of December 31, 2024 (in millions):
 Amortized
Cost		Estimated Fair
Value
Due in less than one year$421.8 $422.0 
Due between one and five years385.0 385.4 
Total$806.8 $807.4 
Schedule of Investments in Equity Securities
The following table presents the Company's investments in equity securities as of December 31, 2024 and 2023 (in millions):
As of December 31,
20242023
Equity investments with readily determinable fair value
Money market funds$562.6 $337.5 
Mutual funds49.1 38.0 
Publicly-traded equity securities12.2 5.1 
Equity investments without readily determinable fair value53.8 45.8 
Equity investment under the equity method of accounting — 26.4 
Total equity securities$677.7 $452.8 
Reported as:
Cash equivalents$562.6 $337.5 
Short-term investments12.2 5.1 
Prepaid expenses and other current assets3.5 2.5 
Other long-term assets99.4 107.7 
Total$677.7 $452.8 
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 Consolidated Balance Sheets as of December 31, 2024 and December 31, 2023 (in millions):
As of December 31,
20242023
Cash and cash equivalents$1,224.3 $1,068.1 
Restricted cash included in Prepaid expenses and other current assets9.2 13.8 
Restricted cash included in Other long-term assets2.3 2.4 
Total cash, cash equivalents, and restricted cash$1,235.8 $1,084.3