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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 18.9 $ (3.0)
Adjustments to reconcile net income (loss) to net cash from operating activities:    
Stock-based compensation expense 108.4 86.5
Depreciation 8.3 7.2
Amortization of debt issuance costs 0.4 0.8
Amortization of intangible assets 1.8 0.0
Changes in fair value of equity security investments (39.5) (12.5)
Deferred income taxes (73.1) (3.4)
Loss on extinguishment of convertible senior notes 0.0 70.0
Other (6.7) 2.3
Change in operating assets and liabilities:    
Accounts receivable (37.5) (93.5)
Inventories 3.4 1.2
Accounts payable and accrued liabilities 22.9 44.2
Other assets and liabilities, net 47.1 (2.2)
Cash flows from operating activities 54.4 97.6
Cash flows from investing activities:    
Purchases of debt securities available-for-sale (530.0) (253.7)
Sales and maturities of debt securities available-for-sale 408.6 277.6
Purchases of equity security investments (31.3) (7.7)
Capital expenditures (15.3) (16.4)
Cash flows from investing activities (168.0) (0.2)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 11.1 8.7
Repurchase of convertible senior notes 0.0 (279.0)
Cash flows from financing activities 11.1 (270.3)
Change in cash, cash equivalents and restricted cash (102.5) (172.9)
Cash, cash equivalents and restricted cash at beginning of period 270.7 344.0
Cash, cash equivalents and restricted cash at end of period 168.2 171.1
Supplemental disclosures:    
Non-cash capital expenditures 0.8 0.9
Right-of-use assets acquired through operating leases 1.8 0.0
Cash paid for interest 1.9 4.6
Cash paid for income taxes $ 3.4 $ 3.1