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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 89.6	$ 407.3	$ 37.0
Reconciliation of net income to net cash provided by operating activities:
Share-based compensation expense	134.2	100.0	75.3
Depreciation	10.9	8.6	7.4
Amortization of debt discount	16.2	20.0	18.9
Amortization of debt issuance costs	1.1	1.4	1.4
Change in fair value of equity securities	(20.9)	17.7	13.0
Deferred income taxes	4.3	(310.7)	0.0
Loss on extinguishment of convertible senior notes	0.0	18.4	0.0
Other	4.4	3.7	(1.2)
Changes in operating assets and liabilities:
Accounts receivable	(28.4)	(30.5)	(69.2)
Inventories	(2.5)	(10.7)	(6.4)
Accounts payable and accrued liabilities	56.8	26.9	54.0
Other assets and liabilities, net	(9.2)	(23.6)	16.8
Net cash provided by operating activities	256.5	228.5	147.0
Cash Flows from Investing Activities:
Purchases of debt securities available-for-sale	(800.1)	(735.5)	(797.2)
Sales and maturities of debt securities available-for-sale	697.9	750.5	669.7
Purchases of equity securities	(4.6)	0.0	(68.9)
Purchases of property and equipment	(23.4)	(10.9)	(14.7)
Net cash (used in) provided by investing activities	(130.2)	4.1	(211.1)
Cash Flows from Financing Activities:
Issuances of common stock under benefit plans	27.5	29.1	32.4
Partial repurchase of convertible senior notes	(0.1)	(186.9)	0.0
Net cash provided by (used in) financing activities	27.4	(157.8)	32.4
Change in cash and cash equivalents and restricted cash	153.7	74.8	(31.7)
Cash and cash equivalents and restricted cash at beginning of period	190.3	115.5	147.2
Cash and cash equivalents and restricted cash at end of period	344.0	190.3	115.5
Supplemental Disclosure:
Non-cash capital expenditures	1.9	1.4	1.0
Right-of-use assets acquired through operating leases	23.4	12.8	77.1
Cash paid for interest	8.6	11.6	11.6
Cash paid for income taxes	$ 5.1	$ 15.3	$ 0.5

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