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Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 407.3	$ 37.0	$ 21.1
Reconciliation of net income to net cash provided by operating activities:
Share-based compensation expense	100.0	75.3	58.1
Depreciation	8.6	7.4	4.0
Amortization of debt discount	20.0	18.9	17.6
Amortization of debt issuance costs	1.4	1.4	1.3
Change in fair value of equity securities	17.7	13.0	0.0
Deferred income taxes (including benefit from valuation allowance release)	(310.7)	0.0	0.0
Loss on extinguishment of convertible senior notes	18.4	0.0	0.0
Other	3.7	(1.2)	1.0
Changes in operating assets and liabilities:
Accounts receivable	(30.5)	(69.2)	(25.1)
Inventories	(10.7)	(6.4)	(3.5)
Accounts payable and accrued liabilities	26.9	54.0	24.2
Other assets and liabilities, net	(23.6)	16.8	2.7
Net cash provided by operating activities	228.5	147.0	101.4
Cash Flows from Investing Activities:
Purchases of debt securities available-for-sale	(735.5)	(797.2)	(545.9)
Sales and maturities of debt securities available-for-sale	750.5	669.7	327.8
Purchases of equity securities	0.0	(68.9)	0.0
Purchases of property and equipment	(10.9)	(14.7)	(24.8)
Net cash provided by (used in) investing activities	4.1	(211.1)	(242.9)
Cash Flows from Financing Activities:
Issuances of common stock under benefit plans	29.1	32.4	29.5
Partial repurchase of convertible senior notes	(186.9)	0.0	0.0
Net cash (used in) provided by financing activities	(157.8)	32.4	29.5
Change in cash and cash equivalents and restricted cash	74.8	(31.7)	(112.0)
Cash and cash equivalents and restricted cash at beginning of period	115.5	147.2	259.2
Cash and cash equivalents and restricted cash at end of period	190.3	115.5	147.2
Supplemental Disclosure:
Non-cash capital expenditures	1.4	1.0	2.3
Right-of-use assets acquired through operating leases	12.8	77.1	0.0
Cash paid for interest	11.6	11.6	11.6
Cash paid for income taxes	$ 15.3	$ 0.5	$ 0.0

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