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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities:
Net income	$ 13.9	$ 32.1
Reconciliation of net income to net cash (used in) provided by operating activities:
Stock-based compensation expense	37.0	32.9
Depreciation	3.3	2.5
Amortization of debt discount	0.0	3.9
Amortization of debt issuance costs	0.4	0.3
Change in fair value of equity security investments	(19.9)	(0.7)
Deferred income taxes	(0.3)	(6.2)
Other	0.8	2.6
Change in operating assets and liabilities:
Accounts receivable	(78.0)	9.3
Inventories	1.5	(2.1)
Accounts payable and accrued liabilities	11.5	11.0
Other assets and liabilities, net	(10.7)	1.7
Net cash (used in) provided by operating activities	(40.5)	87.3
Cash Flows from Investing Activities:
Purchases of debt securities available-for-sale	(192.8)	(93.7)
Sales and maturities of debt securities available-for-sale	176.5	161.3
Purchases of equity securities	(7.7)	0.0
Purchases of property and equipment	(7.6)	(4.5)
Net cash (used in) provided by investing activities	(31.6)	63.1
Cash Flows from Financing Activities:
Issuances of common stock under benefit plans	6.1	15.2
Partial repurchase of convertible senior notes	0.0	(0.1)
Net cash provided by financing activities	6.1	15.1
Change in cash, cash equivalents and restricted cash	(66.0)	165.5
Cash, cash equivalents and restricted cash at beginning of period	344.0	190.3
Cash, cash equivalents and restricted cash at end of period	278.0	355.8
Supplemental Disclosure:
Non-cash capital expenditures	2.8	0.1
Right-of-use assets acquired through operating leases	$ 0.0	$ 16.0

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