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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income including non-controlling interests | $ 606.7 | $ 488.5 | $ 331.7
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation | 207.9 | 191.7 | 174.1
Amortization of deferred contract costs | 175.9 | 137.4 | 107.9
Depreciation and amortization | 84.4 | 68.8 | 61.6
Amortization of investment premiums (discounts) | 6.9 | 1.3 | (6.0)
Loss from equity method investment | 7.6 | 0.0 | 0.0
Other | 7.9 | 6.0 | 5.7
Changes in operating assets and liabilities, net of impact of business combinations: |  |  |
Accounts receivable—net | (72.5) | (176.4) | (96.7)
Inventory | (19.4) | (42.2) | (48.5)
Prepaid expenses and other current assets | (17.7) | (2.8) | (2.1)
Deferred contract costs | (294.5) | (205.1) | (162.3)
Deferred tax assets | (94.0) | (10.5) | 19.4
Other assets | (19.0) | (4.6) | (1.3)
Accounts payable | (13.1) | 37.4 | 7.7
Accrued liabilities | 49.9 | 45.8 | (20.2)
Accrued payroll and compensation | 44.0 | 43.1 | (2.7)
Other liabilities | (0.7) | 9.7 | (0.2)
Deferred revenue | 839.4 | 495.6 | 439.9
Net cash provided by operating activities | 1,499.7 | 1,083.7 | 808.0
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of investments | (2,308.0) | (1,079.0) | (1,332.3)
Sales of investments | 85.5 | 152.2 | 31.3
Maturities of investments | 1,470.3 | 1,018.8 | 925.5
Purchases of property and equipment | (295.9) | (125.9) | (92.2)
Purchases of investment in privately held company | (160.0) | 0.0 | 0.0
Payments made in connection with business combinations, net of cash acquired | (74.9) | (40.2) | (34.6)
Purchases of marketable equity securities | (42.5) | 0.0 | 0.0
Purchases of marketable equity securities | 0.4 | 1.3 | 0.0
Net cash used in investing activities | (1,325.1) | (72.8) | (502.3)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from long-term borrowings, net of discount and underwriting fees | 989.4 | 0.0 | 0.0
Payments for debt issuance costs | (2.4) | 0.0 | 0.0
Payments of debt assumed in connection with business combination | (19.5) | (4.1) | (3.7)
Repurchase and retirement of common stock | (741.8) | (1,080.1) | (145.1)
Proceeds from issuance of common stock | 26.0 | 22.1 | 49.5
Taxes paid related to net share settlement of equity awards | (167.9) | (108.2) | (96.0)
Other | (1.0) | (1.3) | (0.3)
Net cash provided by (used in) financing activities | 82.8 | (1,171.6) | (195.6)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (0.1) | 0.0 | 0.0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 257.3 | (160.7) | 110.1
CASH AND CASH EQUIVALENTS—Beginning of year | 1,061.8 | 1,222.5 | 1,112.4
CASH AND CASH EQUIVALENTS—End of year | 1,319.1 | 1,061.8 | 1,222.5
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Cash paid for income taxes—net | 127.4 | 39.7 | 58.7
Operating lease liabilities arising from obtaining right-of-use assets | 39.6 | 22.8 | 20.4
Finance lease liabilities arising from obtaining right-of-use assets | 0.1 | 0.0 | 3.6
Cash paid to settle liability incurred for repurchase of common stock | 0.0 | 0.0 | 4.2
NON-CASH INVESTING AND FINANCING ACTIVITIES: |  |  |
Transfers of evaluation units from inventory to property and equipment | 15.9 | 20.9 | 21.1
Liability for purchase of property and equipment | 21.9 | 30.8 | 16.0
Liability incurred in connection with business combination | $ 0.9 | $ 0.4 | $ 3.0

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