CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net income	$ 108.4	$ 18.9
Adjustments to reconcile net income to net cash from operating activities:
Stock-based compensation expense	87.6	108.4
Charges associated with convertible senior notes	138.4	0.0
Impairment charges associated with leased properties	14.0	0.0
Depreciation	11.7	8.3
Accretion of discount on investments, net	(14.1)	(6.0)
Amortization of intangible assets	1.8	1.8
Changes in fair value of equity investments	18.3	(39.5)
Deferred income taxes	(56.9)	(73.1)
Other	3.6	(0.3)
Change in operating assets and liabilities:
Accounts receivable	(28.9)	(37.5)
Inventory	(4.2)	3.4
Accounts payable and accrued liabilities	(78.1)	22.9
Other assets and liabilities, net	(6.7)	47.1
Cash flows from operating activities	194.9	54.4
Cash flows from investing activities:
Purchases of debt securities available-for-sale	(511.8)	(530.0)
Sales and maturities of debt securities available-for-sale	451.4	408.6
Purchases of equity securities	0.0	(31.3)
Capital expenditures	(22.8)	(15.3)
Cash flows from investing activities	(83.2)	(168.0)
Cash flows from financing activities:
Issuances of common stock under benefit plans	85.7	11.1
Payments to settle convertible senior notes	(308.8)	0.0
Cash flows from financing activities	(223.1)	11.1
Change in cash, cash equivalents and restricted cash	(111.4)	(102.5)
Cash, cash equivalents and restricted cash at beginning of period	259.1	270.7
Cash, cash equivalents and restricted cash at end of period	147.7	168.2
Supplemental disclosures:
Non-cash capital expenditures	3.3	0.8
Right-of-use assets acquired through operating leases	9.0	1.8
Cash paid for interest	1.6	1.9
Cash paid for income taxes	$ 92.8	$ 3.4