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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Operating activities: |  |
Net income | $ 247.3 | $ 282.6
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 164.6 | 158.6
Impairment of long-lived assets | 53.3 |
Deferred income tax benefit | (3.2) | (3.4)
Gain on sales of property, plant and equipment | (1.9) | (1.2)
Stock-based compensation expense | 17.6 | 20.1
Other | 7.7 | 6.0
Changes in operating assets and liabilities (excluding effect of businesses acquired): |  |
Accounts receivable | 65.4 | (213.9)
Inventories | 156.8 | (333.0)
Prepaid expenses and other assets | (16.1) | 46.1
Accounts payable and other liabilities | 24.8 | 200.9
Net cash provided by operating activities | 716.3 | 162.8
Investing activities: |  |
Purchases of property, plant and equipment | (119.4) | (134.4)
Acquisitions, net of cash acquired |  | (145.0)
Proceeds from sale of business, net |  | 26.2
Other | 5.6 | (8.0)
Net cash used in investing activities | (113.8) | (261.2)
Financing activities: |  |
Net short-term debt borrowings | 9.9 | 4.3
Proceeds from long-term debt borrowings | 510.0 | 535.7
Principal payments on long-term debt | (729.0) | (368.6)
Dividends and dividend equivalents paid | (90.7) | (81.7)
Exercise of stock options | 11.0 | 27.9
Share repurchases | (313.9) |
Other | (5.5) | (2.1)
Net cash (used in) provided by financing activities | (608.2) | 115.5
Effect of exchange rate changes on cash | (6.4) |
(Decrease) increase in cash and cash equivalents | (12.1) | 17.1
Cash and cash equivalents at beginning of year | 106.2 | 83.6
Cash and cash equivalents at end of period | 94.1 | 100.7
Supplemental cash flow information: |  |
Interest paid during the period | 46.5 | 46.4
Income taxes paid during the period, net | $ 168.3 | 103.7
Non-cash investing and financing activities: |  |
Debt assumed in connection with acquisition |  | $ 41.7

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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