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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net income $ 342.3 $ 115.4
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation 122.2 105.6
Depreciation 15.6 12.9
Amortization of inventory fair-value step-up 3.0 0.0
Accretion of discount on available-for-sale debt securities, net (1.6) (8.0)
Realized loss on sale of available-for-sale debt securities 5.2 0.0
Amortization of acquired intangible assets 16.5 2.0
Changes in fair values of equity investments (26.5) 37.3
Deferred income taxes (86.4) (51.1)
Non-cash lease expense 3.6 14.3
Gain on sale of business, net of transaction costs (28.6) 0.0
Other 0.0 1.2
Change in operating assets and liabilities:    
Accounts receivable (165.7) (116.6)
Inventory (2.2) 0.4
Accounts payable and accrued liabilities (22.8) 12.1
Income tax assets and liabilities 60.2 15.8
Other assets and liabilities, net 47.4 25.5
Cash flows from operating activities 282.2 166.8
Cash flows from investing activities:    
Purchases of available-for-sale debt securities (856.9) (588.3)
Sales and maturities of available-for-sale debt securities 2,527.5 596.7
Acquisition of business, net of cash acquired (2,358.5) 0.0
Proceeds from sale of business 63.2 0.0
Capital expenditures (16.9) (23.2)
Cash flows from investing activities (641.6) (14.8)
Cash flows from financing activities:    
Proceeds from borrowings under revolving credit facility 600.0 0.0
Repayments of borrowings under revolving credit facility (600.0) 0.0
Payment of debt issuance costs (6.7) 0.0
Issuances of common stock under benefit plans 108.4 46.5
Taxes paid related to net share settlement of equity awards (58.4) 0.0
Repurchases of common stock (66.0) (167.7)
Cash flows from financing activities (22.7) (121.2)
Effect of exchange rate changes on cash and cash equivalents 0.0 0.2
Change in cash, cash equivalents and restricted cash (382.1) 31.0
Cash, cash equivalents and restricted cash at beginning of period 721.0 241.0
Cash, cash equivalents and restricted cash at end of period $ 338.9 $ 272.0