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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net income $ 7.9 $ 43.4
Adjustments to reconcile net income to net cash from operating activities:    
Stock-based compensation expense 52.8 44.5
Charges associated with convertible senior notes 0.0 88.7
Depreciation 6.6 5.3
Accretion of discount on available-for-sale debt securities, net (4.6) (7.1)
Amortization of intangible assets 1.0 0.9
Changes in fair values of equity investments 30.6 (1.6)
Deferred income taxes (13.7) (15.6)
Other 7.9 3.4
Change in operating assets and liabilities:    
Accounts receivable (36.9) (11.3)
Inventory (1.7) 1.1
Accounts payable and accrued liabilities 12.4 (18.6)
Other assets and liabilities, net 2.5 (2.8)
Cash flows from operating activities 64.8 130.3
Cash flows from investing activities:    
Purchases of available-for-sale debt securities (273.2) (320.1)
Sales and maturities of available-for-sale debt securities 298.1 276.3
Capital expenditures (10.7) (11.2)
Cash flows from investing activities 14.2 (55.0)
Cash flows from financing activities:    
Issuances of common stock under benefit plans 32.1 69.9
Repurchases of common stock (150.0) 0.0
Cash flows from financing activities (117.9) 69.9
Change in cash, cash equivalents and restricted cash (38.9) 145.2
Cash, cash equivalents and restricted cash at beginning of period 241.0 259.1
Cash, cash equivalents and restricted cash at end of period 202.1 404.3
Supplemental disclosures:    
Accrued capital expenditures 2.7 1.1
Cash paid for income taxes $ 0.6 $ 0.2