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Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities |  |  |
Net income | $ 366.7 | $ 137.1 | $ 114.5
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities |  |  |
Asset impairments and related indirect inventory obsolescence | 5.8 | 8.7 | 8.7
Depreciation and amortization | 152.2 | 139.4 | 131.6
Deferred income taxes | (343.8) | 17.2 | (8.0)
Stock-based compensation | 2.4 | 4.5 | 9.4
Pensions and other postretirement benefits, net of contributions | (208.4) | (33.3) | (28.8)
(Gain) loss on retirement of equipment and held-for-sale assets, net | (1.9) | (6.9) | 2.9
Debt refinancing and redemption costs | 1.5 | 1.8 | 0
Changes in Operating Assets and Liabilities |  |  |
Accounts receivable | (130.6) | (189.9) | (14.8)
Inventories | (49.9) | (50.2) | (38.9)
Accounts payable and accrued expenses | 60.9 | 37.1 | 112.0
Deferred revenue | (21.6) | (74.7) | (70.1)
Other assets and liabilities | (8.8) | (47.1) | 21.8
Net cash provided by (used in) operating activities | (175.5) | (56.3) | 240.3
Investing activities |  |  |
Purchases of property, plant and equipment | (207.6) | (163.1) | (108.3)
Proceeds from sale of property, plant and equipment | 10.1 | 8.9 | 4.9
Sale Leaseback Transaction, Net Proceeds | 12.1 | 0 | 0
Purchase buyouts of leased equipment | 0 | (13.4) | (7.8)
Acquisition, net | 0 | (16.5) | (2.2)
Redemption of short-term investments | 0 | 0 | 6.4
Net cash used in investing activities | (185.4) | (184.1) | (107.0)
Financing Activities |  |  |
Net short-term borrowings (repayments) under credit facilities | 10.4 | 2.6 | (60.0)
Proceeds from issuance of long-term debt | 562.6 | 227.0 | 6.2
Payments of other long-term debt and capital lease obligations | (299.1) | (56.0) | (8.1)
Debt issuance costs | (10.6) | (10.9) | (2.2)
Purchase of noncontrolling interest | (4.0) | 0 | (2.1)
Employee stock option exercises, including tax benefit | 0.1 | 4.6 | 1.1
Purchase of treasury stock | (5.9) | (0.1) | (1.3)
Net cash provided by (used in) financing activities | 253.5 | 167.2 | (66.4)
Effect of exchange rate changes on cash | 0.6 | (2.2) | (0.4)
Net increase (decrease) in cash and cash equivalents | (106.8) | (75.4) | 66.5
Cash and cash equivalents at beginning of year | 169.2 | 244.6 | 178.1
Cash and cash equivalents at end of year | 62.4 | 169.2 | 244.6
Supplemental Cash Flow Information |  |  |
Interest paid | 88.9 | 73.1 | 61.6
Income taxes paid (refunds received) | $ 14.7 | $ 10.9 | $ (43.1)

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- Definition The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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