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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 324.9 $ 238.2
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation expense 159.3 129.1
Charges associated with convertible senior notes 0.0 138.4
Operating lease, impairment loss 0.7 14.0
Depreciation 19.6 17.3
Accretion of discount on available-for-sale debt securities, net (10.7) (20.6)
Amortization of intangible assets 3.0 2.7
Changes in fair values of equity investments 6.7 35.2
Deferred income taxes 117.2 (91.8)
Non-cash lease expense 20.9 3.9
Other 0.7 0.0
Change in operating assets and liabilities:    
Accounts receivable (248.9) (41.8)
Inventory (11.9) (7.5)
Accounts payable and accrued liabilities 83.7 (33.9)
Income tax assets and liabilities (54.3) (4.8)
Other assets and liabilities, net (16.6) (25.5)
Cash flows from operating activities 394.3 352.9
Cash flows from investing activities:    
Purchases of available-for-sale debt securities (996.8) (744.3)
Sales and maturities of available-for-sale debt securities 821.7 716.7
Capital expenditures (36.4) (30.9)
Cash flows from investing activities (211.5) (58.5)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 92.1 112.1
Repurchases of common stock (167.7) 0.0
Payments to settle convertible senior notes 0.0 (308.8)
Cash flows from financing activities (75.6) (196.7)
Effect of exchange rate changes on cash and cash equivalents 0.0 0.3
Change in cash, cash equivalents and restricted cash 107.2 98.0
Cash, cash equivalents and restricted cash at beginning of period 241.0 259.1
Cash, cash equivalents and restricted cash at end of period 348.2 357.1
Supplemental disclosures:    
Accrued capital expenditures 0.6 0.8
Right-of-use assets acquired through operating leases 0.0 9.0
Cash paid for interest 0.0 1.6
Cash paid for income taxes $ 73.6 $ 144.5