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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash Flows from Operating Activities |  |
Net income | $ 324.9 | $ 144.9
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | (218.6) | 0.0
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 67.5 | 65.6
Stock-based compensation | 41.7 | 23.9
Deferred Income Taxes and Tax Credits | (42.4) | 0.0
Other | 3.7 | 5.4
Changes in operating assets and liabilities: |  |
Accounts receivable | (99.5) | (18.4)
Prepaid expenses and income taxes | 12.6 | 19.2
Accounts payable | (12.0) | 13.3
Accrued payroll and contract professional pay | 75.3 | 27.9
Income taxes payable | 130.6 | 0.8
Other | (7.9) | 55.2
Net cash provided by operating activities | 275.9 | 337.8
Cash Flows from Investing Activities: |  |
Cash paid for property and equipment | (25.6) | (28.3)
Cash paid for acquisitions, net of cash acquired | (224.4) | (151.5)
Cash received from sale of discontinued operations | 499.1 | 0.0
Other | 0.1 | (0.3)
Net cash used in investing activities | 249.2 | (180.1)
Cash Flows from Financing Activities: |  |
Proceeds from long-term debt | 0.0 | 65.5
Principal payments of long-term debt | 0.0 | (65.5)
Debt issuance and amendment costs | (1.4) | (1.2)
Proceeds from option exercises and employee stock purchase plan | 14.3 | 11.7
Payment of employment taxes related to release of restricted stock awards | (13.9) | (7.0)
Repurchase of common stock | (118.4) | (27.9)
Net cash used in financing activities | (119.4) | (24.4)
Effect of exchange rate changes on cash and cash equivalents | (0.7) | 1.2
Net Increase in Cash and Cash Equivalents | 405.0 | 134.5
Cash and Cash Equivalents at Beginning of Year | 274.4 | 95.2
Cash and Cash Equivalents at End of Period | 679.4 | 229.7
Supplemental Disclosure of Cash Flow Information Cash paid for: |  |
Income Taxes Paid | 39.6 | 40.7
Interest | 20.1 | 22.4
Operating leases | $ 25.3 | $ 25.0

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