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Cash Equivalents and Investments (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023 and December 31, 2022 (in millions):
As of December 31, 2023
As of December 31, 2022
Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value		Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value
Fixed income securities:
Asset-backed and mortgage-backed securities$38.2 $0.2 $(0.4)$38.0 $37.8 $— $(1.2)$36.6 
Certificates of deposit3.0 — — 3.0 — — — — 
Commercial paper41.1 — — 41.1 — — — — 
Corporate debt securities160.2 0.7 (1.3)159.6 277.5 — (7.1)270.4 
Foreign government debt securities
5.3 — (0.2)5.1 8.8 — (0.4)8.4 
Time deposits273.6 — — 273.6 70.6 — — 70.6 
U.S. government agency securities
4.0 — — 4.0 18.6 — (0.6)18.0 
U.S. government securities54.8 0.1 — 54.9 9.0 — (0.2)8.8 
Total fixed income securities
580.2 1.0 (1.9)579.3 422.3 — (9.5)412.8 
Privately-held debt and redeemable preferred stock securities
20.6 37.4 (8.3)49.7 15.5 37.4 — 52.9 
Total available-for-sale debt securities
$600.8 $38.4 $(10.2)$629.0 $437.8 $37.4 $(9.5)$465.7 
Reported as:
Cash equivalents$328.2 $— $— $328.2 $70.6 $— $— $70.6 
Short-term investments135.7 — (1.4)134.3 205.9 — (3.3)202.6 
Long-term investments116.3 1.0 (0.5)116.8 145.8 — (6.2)139.6 
Other long-term assets20.6 37.4 (8.3)49.7 15.5 37.4 — 52.9 
Total$600.8 $38.4 $(10.2)$629.0 $437.8 $37.4 $(9.5)$465.7 
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, 2023 (in millions):
 Amortized
Cost		Estimated Fair
Value
Due in less than one year$463.9 $462.5 
Due between one and five years116.3 116.8 
Total$580.2 $579.3 
Schedule of Investments in Equity Securities
The following table presents the Company's investments in equity securities as of December 31, 2023 and 2022 (in millions):
As of December 31,
20232022
Equity investments with readily determinable fair value
Money market funds$337.5 $420.8 
Mutual funds38.0 28.1 
Publicly-traded equity securities5.1 7.7 
Equity investments without readily determinable fair value45.8 137.7 
Equity investment under the equity method of accounting 26.4 36.0 
Total equity securities$452.8 $630.3 
Reported as:
Cash equivalents$337.5 $420.8 
Short-term investments5.1 7.7 
Prepaid expenses and other current assets2.5 2.4 
Other long-term assets107.7 199.4 
Total$452.8 $630.3 
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, 2023 and December 31, 2022 (in millions):
As of December 31,
20232022
Cash and cash equivalents$1,068.1 $880.1 
Restricted cash included in Prepaid expenses and other current assets13.8 15.2 
Restricted cash included in Other long-term assets2.4 2.4 
Total cash, cash equivalents, and restricted cash$1,084.3 $897.7