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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net income $ 238.2 $ 102.0
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation expense 129.1 156.2
Charges associated with convertible senior notes 138.4 0.0
Impairment charges associated with leased properties 14.0 0.0
Depreciation 17.3 12.9
Accretion of discount on available-for-sale debt securities, net (20.6) (12.0)
Amortization of intangible assets 2.7 2.7
Changes in fair values of equity investments 35.2 0.6
Deferred income taxes (91.8) (77.3)
Other 3.9 (0.6)
Change in operating assets and liabilities:    
Accounts receivable (41.8) (67.9)
Inventory (7.5) 6.3
Accounts payable and accrued liabilities (38.7) 147.3
Other assets and liabilities, net (25.5) (3.8)
Cash flows from operating activities 352.9 266.4
Cash flows from investing activities:    
Purchases of available-for-sale debt securities (744.3) (892.7)
Sales and maturities of available-for-sale debt securities 716.7 681.6
Purchases of equity investments 0.0 (31.3)
Capital expenditures (30.9) (22.9)
Cash flows from investing activities (58.5) (265.3)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 112.1 29.9
Payments to settle convertible senior notes (308.8) 0.0
Cash flows from financing activities (196.7) 29.9
Effect of exchange rate changes on cash and cash equivalents 0.3 0.0
Change in cash, cash equivalents and restricted cash 98.0 31.0
Cash, cash equivalents and restricted cash at beginning of period 259.1 270.7
Cash, cash equivalents and restricted cash at end of period 357.1 301.7
Supplemental disclosures:    
Accrued capital expenditures 0.8 0.9
Right-of-use assets acquired through operating leases 9.0 1.8
Cash paid for interest 1.6 1.9
Cash paid for income taxes $ 144.5 $ 5.0