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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash flows from operating activities: |  |
Net income | $ 102.0 | $ 65.5
Adjustments to reconcile net income to net cash from operating activities: |  |
Stock-based compensation expense | 156.2 | 129.6
Depreciation | 12.9 | 11.2
Amortization of debt issuance costs | 0.6 | 1.0
Amortization of intangible assets | 2.7 | 0.0
Changes in fair value of equity security investments | 0.6 | (23.6)
Deferred income taxes | (77.3) | 5.6
Loss on extinguishment of convertible senior notes | 0.0 | 70.0
Other | (13.2) | 3.0
Change in operating assets and liabilities: |  |
Accounts receivable | (67.9) | (115.7)
Inventories | 6.3 | (6.5)
Accounts payable and accrued liabilities | 147.3 | 77.0
Other assets and liabilities, net | (3.8) | (20.7)
Cash flows from operating activities | 266.4 | 196.4
Cash flows from investing activities: |  |
Purchases of debt securities available-for-sale | (892.7) | (387.9)
Sales and maturities of debt securities available-for-sale | 681.6 | 348.8
Purchases of equity security investments | (31.3) | (7.7)
Capital expenditures | (22.9) | (14.7)
Cash flows from investing activities | (265.3) | (61.5)
Cash flows from financing activities: |  |
Issuances of common stock under benefit plans | 29.9 | 20.1
Repurchase of convertible senior notes | 0.0 | (279.0)
Cash flows from financing activities | 29.9 | (258.9)
Change in cash, cash equivalents and restricted cash | 31.0 | (124.0)
Cash, cash equivalents and restricted cash at beginning of period | 270.7 | 344.0
Cash, cash equivalents and restricted cash at end of period | 301.7 | 220.0
Supplemental disclosures: |  |
Non-cash capital expenditures | 0.9 | 0.7
Right-of-use assets acquired through operating leases | 1.8 | 0.0
Cash paid for interest | 1.9 | 4.6
Cash paid for income taxes | $ 5.0 | $ 4.3

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