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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 154.5	$ 89.6	$ 407.3
Adjustments to reconcile net income to net cash from operating activities:
Stock-based compensation expense	173.1	134.2	100.0
Depreciation	15.1	10.9	8.6
Amortization of debt discount	0.0	16.2	20.0
Amortization of debt issuance costs	1.2	1.1	1.4
Amortization of intangible assets	0.5	0.0	0.0
Change in fair value of equity securities	(30.8)	(20.9)	17.7
Deferred income taxes	19.1	4.3	(310.7)
Loss on extinguishment of convertible senior notes	70.0	0.0	18.4
Other	4.1	4.4	3.7
Changes in operating assets and liabilities:
Accounts receivable	(162.2)	(28.4)	(30.5)
Inventories	(2.6)	(2.5)	(10.7)
Accounts payable and accrued liabilities	114.6	56.8	26.9
Other assets and liabilities, net	(17.2)	(9.2)	(23.6)
Cash flows from operating activities	339.4	256.5	228.5
Cash flows from investing activities:
Purchases of debt securities available-for-sale	(621.2)	(800.1)	(735.5)
Sales and maturities of debt securities available-for-sale	511.0	697.9	750.5
Acquisition of business, net of cash acquired	(42.7)	0.0	0.0
Purchases of equity securities	(7.7)	(4.6)	0.0
Capital expenditures	(16.5)	(23.4)	(10.9)
Cash flows from investing activities	(177.1)	(130.2)	4.1
Cash flows from financing activities:
Issuances of common stock under benefit plans	44.7	27.5	29.1
Repurchases of convertible senior notes	(279.0)	(0.1)	(186.9)
Cash flows from financing activities	(234.3)	27.4	(157.8)
Effect of exchange rate changes on cash and cash equivalents	(1.3)	0.0	0.0
Change in cash and cash equivalents and restricted cash	(73.3)	153.7	74.8
Cash and cash equivalents and restricted cash at beginning of period	344.0	190.3	115.5
Cash and cash equivalents and restricted cash at end of period	270.7	344.0	190.3
Supplemental Disclosure:
Non-cash capital expenditures	0.7	1.9	1.4
Right-of-use assets acquired through operating leases	0.0	23.4	12.8
Cash paid for interest	6.6	8.6	11.6
Cash paid for income taxes	$ 14.4	$ 5.1	$ 15.3

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