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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Operating Activities: |  |  |
Net Income | $ 200.3 | $ 174.7 | $ 157.7
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 89.7 | 91.2 | 95.0
Share-based compensation | 32.3 | 39.3 | 31.5
Deferred Income Taxes and Tax Credits | 1.3 | 18.9 | 11.2
Write-off of loan costs | 0.0 | 18.9 | 0.0
Other | 5.9 | 16.0 | 18.6
Changes in operating assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | (12.9) | (24.3) | (90.7)
Prepaid expenses and income taxes | 6.5 | (20.8) | 14.8
Income taxes payable | (0.3) | (2.2) | 2.1
Accounts payable | 0.8 | (7.3) | 23.3
Accrued payroll and contract professional pay | 12.6 | 5.0 | 25.4
Operating Right of Use Assets | 31.4 | 28.0 | 0.0
Operating Lease Liabilities | (31.0) | (26.7) | 0.0
Payroll tax deferral and other | 88.2 | 2.5 | (1.5)
Net cash provided by operating activities | 424.8 | 313.2 | 287.4
Cash Flows from Investing Activities |  |  |
Cash paid for property and equipment | (32.6) | (32.7) | (28.7)
Cash paid for acquisitions, net of cash acquired | (186.2) | (116.4) | (760.2)
Other | (0.2) | 0.0 | 0.2
Net cash used in investing activities | (219.0) | (149.1) | (788.7)
Cash Flows from Financing Activities |  |  |
Proceeds from Issuance of Long-term Debt | 65.5 | 653.0 | 822.0
Principal payments of long-term debt | (65.5) | (736.2) | (286.0)
Debt issuance or amendment costs | (1.2) | (7.8) | (22.5)
Proceeds from option exercises and employee stock purchase plan | 12.1 | 12.7 | 9.4
Payment of employment taxes related to release of restricted stock awards | (12.0) | (12.2) | (5.6)
Repurchase of common stock | (27.9) | (20.0) | 0.0
Other | 0.0 | 0.0 | (9.5)
Net cash (used in) provided by financing activities | (29.0) | (110.5) | 507.8
Effect of exchange rate changes on cash and cash equivalents | 2.4 | (0.2) | (1.4)
Net Increase in Cash and Cash Equivalents | 179.2 | 53.4 | 5.1
Cash and Cash Equivalents | 274.4 | 95.2 | 41.8
Supplemental Disclosure of Cash Flow Information |  |  |
Income taxes | 64.2 | 56.6 | 21.4
Interest | 37.6 | 44.9 | 51.0
Non-Cash Investing and Financing Activities: |  |  |
Operating lease right-of-use assets obtained in exchange for operating lease liabilities | $ 20.6 | $ 30.0 | $ 0.0

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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