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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income $ 102.0 $ 65.5
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation expense 156.2 129.6
Depreciation 12.9 11.2
Amortization of debt issuance costs 0.6 1.0
Amortization of intangible assets 2.7 0.0
Changes in fair value of equity security investments 0.6 (23.6)
Deferred income taxes (77.3) 5.6
Loss on extinguishment of convertible senior notes 0.0 70.0
Other (13.2) 3.0
Change in operating assets and liabilities:    
Accounts receivable (67.9) (115.7)
Inventories 6.3 (6.5)
Accounts payable and accrued liabilities 147.3 77.0
Other assets and liabilities, net (3.8) (20.7)
Cash flows from operating activities 266.4 196.4
Cash flows from investing activities:    
Purchases of debt securities available-for-sale (892.7) (387.9)
Sales and maturities of debt securities available-for-sale 681.6 348.8
Purchases of equity security investments (31.3) (7.7)
Capital expenditures (22.9) (14.7)
Cash flows from investing activities (265.3) (61.5)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 29.9 20.1
Repurchase of convertible senior notes 0.0 (279.0)
Cash flows from financing activities 29.9 (258.9)
Change in cash, cash equivalents and restricted cash 31.0 (124.0)
Cash, cash equivalents and restricted cash at beginning of period 270.7 344.0
Cash, cash equivalents and restricted cash at end of period 301.7 220.0
Supplemental disclosures:    
Non-cash capital expenditures 0.9 0.7
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 $ 5.0 $ 4.3