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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net (loss) income	$ (76.6)	$ 13.9
Adjustments to reconcile net (loss) income to net cash from operating activities:
Stock-based compensation expense	39.9	37.0
Depreciation	4.1	3.3
Amortization of debt issuance costs	0.2	0.4
Amortization of intangible assets	0.9	0.0
Changes in fair value of equity security investments	(2.2)	(19.9)
Deferred income taxes	(31.6)	(0.3)
Other	(2.4)	0.8
Change in operating assets and liabilities:
Accounts receivable	(41.7)	(78.0)
Inventories	1.8	1.5
Accounts payable and accrued liabilities	6.7	11.5
Other assets and liabilities, net	(24.3)	(10.7)
Cash flows from operating activities	(125.2)	(40.5)
Cash flows from investing activities:
Purchases of debt securities available-for-sale	(206.2)	(192.8)
Sales and maturities of debt securities available-for-sale	203.9	176.5
Purchases of equity security investments	(31.3)	(7.7)
Capital expenditures	(8.5)	(7.6)
Cash flows from investing activities	(42.1)	(31.6)
Cash flows from financing activities:
Issuances of common stock under benefit plans	8.2	6.1
Cash flows from financing activities	8.2	6.1
Change in cash, cash equivalents and restricted cash	(159.1)	(66.0)
Cash, cash equivalents and restricted cash at beginning of period	270.7	344.0
Cash, cash equivalents and restricted cash at end of period	111.6	278.0
Supplemental disclosures:
Non-cash capital expenditures	0.6	2.8
Cash paid for income taxes	$ 0.2	$ 0.0

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