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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities |  |
Net income | $ 489.3 | $ 416.3
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 38.3 | 40.0
Stock-based compensation (Note 9) | 37.6 | 30.5
Impairment charge (Note 4) | 0.0 | 31.0
Change in fair value of contingent consideration liabilities, net (Note 7) | 14.7 | 4.2
Deferred income taxes | 18.9 | 43.7
Purchased in-process research and development | 0.0 | 5.7
Other | 2.0 | (1.0)
Changes in operating assets and liabilities: |  |
Accounts and other receivables, net | 2.6 | (74.8)
Inventories | (20.5) | (72.2)
Accounts payable and accrued liabilities | (89.2) | (59.5)
Income taxes | (188.9) | (46.0)
Prepaid expenses and other current assets | (11.5) | 1.3
Other | (1.8) | 6.8
Net cash provided by operating activities | 291.5 | 326.0
Cash flows from investing activities |  |
Capital expenditures | (96.0) | (73.9)
Purchases of held-to-maturity investments (Note 5) | 0.0 | (505.6)
Proceeds from held-to-maturity investments (Note 5) | 339.5 | 232.0
Purchases of available-for sale investments (Note 5) | 0.0 | (332.3)
Proceeds from available-for-sale investments (Note 5) | 101.1 | 289.4
Investments in intangible assets and in-process research and development | (3.0) | (6.4)
Investments in trading securities, net | (4.7) | (5.8)
Investments in unconsolidated affiliates, net (Note 5) | (3.2) |
Investments in unconsolidated affiliates, net (Note 5) |  | 0.3
Payment of contingent consideration | (10.0) | 0.0
Acquisition of business, net of cash acquired | 0.0 | (84.8)
Other | 1.5 | 0.1
Net cash provided by (used in) investing activities | 325.2 | (487.0)
Cash flows from financing activities |  |
Proceeds from issuance of debt (Note 6) | 685.8 | 985.4
Payments on debt and capital lease obligations (Note 6) | (522.2) | (808.2)
Purchases of treasury stock | (350.4) | (511.2)
Equity forward contract related to accelerated share repurchase agreement (Note 10) | (80.0) | 0.0
Proceeds from stock plans | 84.3 | 68.7
Payment of contingent consideration | (15.1) | 0.0
Other | (2.2) | 0.8
Net cash used in financing activities | (199.8) | (264.5)
Effect of currency exchange rate changes on cash and cash equivalents | (8.8) | 3.6
Net increase (decrease) in cash and cash equivalents | 408.1 | (421.9)
Cash and cash equivalents at beginning of period | 818.3 | 930.1
Cash and cash equivalents at end of period | $ 1,226.4 | $ 508.2

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- Definition The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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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=109223946&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=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + 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 (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The amount of the write-off for research and development assets that were acquired in a transaction other than a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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://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=109223946&loc=d3e3602-108585 + Details
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