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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net income $ 115.4 $ 108.4
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation expense 105.6 87.6
Charges associated with convertible senior notes 0.0 138.4
Impairment charges associated with leased properties 0.7 14.0
Depreciation 12.9 11.7
Accretion of discount on available-for-sale debt securities, net (8.0) (14.1)
Amortization of intangible assets 2.0 1.8
Changes in fair values of equity investments 37.3 18.3
Deferred income taxes (51.1) (56.9)
Non-cash lease expense 14.3 3.6
Other 0.5 0.0
Change in operating assets and liabilities:    
Accounts receivable (116.6) (28.9)
Inventory 0.4 (4.2)
Accounts payable and accrued liabilities 27.9 (78.1)
Other assets and liabilities, net 25.5 (6.7)
Cash flows from operating activities 166.8 194.9
Cash flows from investing activities:    
Purchases of available-for-sale debt securities (588.3) (511.8)
Sales and maturities of available-for-sale debt securities 596.7 451.4
Capital expenditures (23.2) (22.8)
Cash flows from investing activities (14.8) (83.2)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 46.5 85.7
Repurchases of common stock (167.7) 0.0
Payments to settle convertible senior notes 0.0 (308.8)
Cash flows from financing activities (121.2) (223.1)
Effect of exchange rate changes on cash and cash equivalents 0.2 0.0
Change in cash, cash equivalents and restricted cash 31.0 (111.4)
Cash, cash equivalents and restricted cash at beginning of period 241.0 259.1
Cash, cash equivalents and restricted cash at end of period 272.0 147.7
Supplemental disclosures:    
Accrued capital expenditures 1.9 3.3
Right-of-use assets acquired through operating leases 3.4 9.0
Cash paid for interest 0.0 1.6
Cash paid for income taxes $ 72.5 $ 92.8