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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities: |  |  |
Net income | $ 374.7 | $ 369.5 | $ 292.6
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 107.5 | 137.9 | 139.6
Amortization of deferred commissions costs | 95.2 | 76.1 | 63.4
Amortization of Senior Notes discount and issuance costs | 2.4 | 2.4 | 2.3
Non-cash lease expense | 30.0 | 38.5 | 28.5
Stock-based compensation expense | 85.0 | 75.2 | 63.7
Deferred income taxes, net | (37.2) | (31.2) | 24.2
Credit loss expense | 35.0 | 18.3 | 10.9
Other operating activities, net | (3.2) | (2.4) | (0.7)
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | (66.6) | (46.4) | (29.6)
Prepaid expenses and other current assets | (16.2) | (17.9) | (14.9)
Deferred commissions | (120.2) | (116.8) | (72.0)
Accounts payable and other liabilities | 33.9 | 23.2 | (30.2)
Lease liabilities | (39.2) | (37.4) | (30.9)
Income taxes payable, net | 10.7 | (19.3) | 5.9
Deferred revenue | (1.3) | 6.8 | 17.4
Other assets | (1.0) | 2.2 | (0.5)
Net cash provided by operating activities | 489.5 | 478.7 | 469.7
Investing activities: |  |  |
Proceeds from sale and settlement of investments | 3.8 | 0.9 | 0.0
Proceeds from sale of property and equipment and other assets | 0.0 | 30.1 | 0.6
Purchase and construction of Richmond assets | (117.5) | (35.2) | (123.7)
Purchases of property and equipment and other assets | (25.3) | (58.6) | (65.2)
Cash paid for acquisitions, net of cash acquired | (99.6) | (6.3) | (193.0)
Net cash used in investing activities | (238.6) | (69.1) | (381.3)
Financing activities: |  |  |
Payments of long-term debt assumed in acquisition | 0.0 | (2.2) | 0.0
Repurchase of restricted stock to satisfy tax withholding obligations | (26.4) | (23.0) | (33.3)
Proceeds from equity offering, net of transaction costs | 0.0 | 745.7 | 0.0
Proceeds from exercise of stock options and employee stock purchase plan | 23.4 | 13.5 | 18.0
Other financing activities | (0.7) | 0.0 | (0.4)
Net cash (used in) provided by financing activities | (3.7) | 734.0 | (15.7)
Effect of foreign currency exchange rates on cash and cash equivalents | 0.7 | (2.7) | (1.5)
Net increase in cash and cash equivalents | 247.9 | 1,140.9 | 71.2
Cash and cash equivalents at beginning of year | 4,968.0 | 3,827.1 | 3,755.9
Cash and cash equivalents at end of year | 5,215.9 | 4,968.0 | 3,827.1
Supplemental cash flow disclosures: |  |  |
Interest paid | 30.7 | 29.9 | 31.5
Income taxes paid | 163.2 | 169.2 | 82.1
Supplemental non-cash investing and financing activities: |  |  |
Consideration owed for acquisitions | 7.6 | 0.0 | 0.1
Accrued capital expenditures and non-cash landlord incentives | $ 28.9 | $ 14.7 | $ 2.1

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