Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022 and December 31, 2021 (in millions):

	As of December 31, 2022								As of December 31, 2021
	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	$	37.8	$	—	$	(1.2)	$	36.6	$	139.1	$	—	$	(0.5)	$	138.6
Certificates of deposit	—		—		—		—		5.0		—		—		5.0
Commercial paper	—		—		—		—		75.8		—		—		75.8
Corporate debt securities	277.5		—		(7.1)		270.4		443.3		0.7		(1.5)		442.5
Foreign government debt securities	8.8		—		(0.4)		8.4		12.8		—		(0.1)		12.7
Time deposits	70.6		—		—		70.6		35.2		—		—		35.2
U.S. government agency securities	18.6		—		(0.6)		18.0		26.8		—		(0.1)		26.7
U.S. government securities	9.0		—		(0.2)		8.8		73.5		0.1		—		73.6
Total fixed income securities	422.3		—		(9.5)		412.8		811.5		0.8		(2.2)		810.1
Privately-held debt and redeemable preferred stock securities	15.5		37.4		—		52.9		9.6		37.4		—		47.0
Total available-for-sale debt securities	$	437.8	$	37.4	$	(9.5)	$	465.7	$	821.1	$	38.2	$	(2.2)	$	857.1
Reported as:
Cash equivalents	$	70.6	$	—	$	—	$	70.6	$	47.2	$	—	$	—	$	47.2
Short-term investments	205.9		—		(3.3)		202.6		306.8		0.7		(0.1)		307.4
Long-term investments	145.8		—		(6.2)		139.6		457.5		0.1		(2.1)		455.5
Other long-term assets	15.5		37.4		—		52.9		9.6		37.4		—		47.0
Total	$	437.8	$	37.4	$	(9.5)	$	465.7	$	821.1	$	38.2	$	(2.2)	$	857.1

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, 2022 (in millions):

	Amortized Cost		Estimated Fair Value
Due in less than one year	$	276.5	$	273.2
Due between one and five years	145.8		139.6
Total	$	422.3	$	412.8

Schedule of Investments in Equity Securities

The following table presents the Company's investments in equity securities as of December 31, 2022 and 2021 (in millions):

	As of December 31,
	2022		2021
Equity investments with readily determinable fair value
Money market funds	$	420.8	$	382.0
Mutual funds	28.1		33.4
Publicly-traded equity securities	7.7		8.1
Equity investments without readily determinable fair value	137.7		150.1
Equity investment under the equity method of accounting	36.0		—
Total equity securities	$	630.3	$	573.6
Reported as:
Cash equivalents	$	420.8	$	371.5
Short-term investments	7.7		8.1
Prepaid expenses and other current assets	2.4		15.1
Other long-term assets	199.4		178.9
Total	$	630.3	$	573.6

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, 2022 and December 31, 2021 (in millions):

	As of December 31,
	2022		2021
Cash and cash equivalents	$	880.1	$	922.5
Restricted cash included in Prepaid expenses and other current assets	15.2		17.2
Restricted cash included in Other long-term assets	2.4		3.0
Total cash, cash equivalents, and restricted cash	$	897.7	$	942.7