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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash Flows from Operating Activities: |  |
Net income | $ 135.4 | $ 111.8
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 68.8 | 71.3
Stock-based compensation | 31.1 | 22.4
Allowance for doubtful accounts | 3.0 | 2.1
Workers’ compensation provision | 2.3 | 2.5
Other | 6.8 | 13.0
Changes in operating assets and liabilities: |  |
Accounts receivable | (30.3) | (47.8)
Prepaid expenses and income taxes | (1.9) | 12.5
Accounts payable | (17.9) | 9.9
Accrued payroll and contract professional pay | 25.1 | 26.9
Income taxes payable | 15.5 | 6.8
Workers’ compensation loss reserves | (2.4) | (2.3)
Operating lease right of use assets | 20.9 | 0.0
Operating lease liabilities | (21.3) | 0.0
Other | (3.3) | (5.5)
Net Cash Provided by Operating Activities | 231.8 | 223.6
Cash Flows from Investing Activities: |  |
Cash paid for property and equipment | (22.8) | (22.1)
Cash paid for acquisitions, net of cash acquired | (48.5) | (760.3)
Other | (0.1) | (0.1)
Net cash used in investing activities | (71.4) | (782.5)
Cash Flows from Financing Activities: |  |
Proceeds from long-term debt | 59.0 | 822.0
Principal payments of long-term debt | (178.0) | (231.0)
Payments of Debt Issuance Costs | 0.0 | 22.5
Proceeds from option exercises and employee stock purchase plan | 12.7 | 9.3
Payment of employment taxes related to release of restricted stock awards | (7.7) | (4.4)
Payments for Repurchase of Common Stock | (20.0) | 0.0
Proceeds from (Payments for) Other Financing Activities | 0.0 | (9.5)
Net Cash provided by (used in) Financing Activities | (134.0) | 563.9
Effect of exchange rate changes on cash and cash equivalents | (0.7) | (0.8)
Net Increase (Decrease) in Cash and Cash Equivalents | 25.7 | 4.2
Cash and Cash Equivalents at Beginning of Year | 41.8 | 36.7
Cash and Cash Equivalents at End of Period | 67.5 | 40.9
Supplemental Disclosure of Cash Flow Information: |  |
Income taxes | 36.6 | 10.2
Interest | 37.0 | 37.8
Supplemental Disclosure of Non-Cash Transactions: |  |
Unpaid portion of additions to property and equipment | $ 1.1 | $ 1.7

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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