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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income (loss) | $ (484.1) | $ (56.8) | $ 337.5
Depreciation and amortization | 536.9 | 528.8 | 428.5
Impairment charges | 667.9 | 515.5 | 1.5
Deferred income taxes | (94.6) | (35.0) | (154.2)
Stock-based compensation | 22.4 | 27.9 | 43.4
Pensions and other postretirement benefits, net of contributions | (8.8) | (9.9) | (6.0)
(Gain) loss on sale or acquisition of business | 10.5 | (15.5) | 0.0
(Gain) loss on disposal of property, plant and equipment, net | 4.1 | (3.2) | 1.6
Debt refinancing and redemption costs and (gain) on settlement of capital lease | 8.4 | 4.0 | 3.5
Changes in operating assets and liabilities, net of amounts acquired or disposed |  |  |
Accounts receivable | 63.9 | 56.1 | (44.9)
Inventories | 56.1 | (83.1) | 2.5
Accounts payable and accrued expenses | (97.7) | 7.5 | (12.6)
Deferred revenue | (17.9) | 10.7 | 14.8
Other assets and liabilities | (107.5) | (175.5) | 31.4
Net cash provided by operating activities | 559.6 | 771.5 | 647.0
Investing activities |  |  |
Purchases of property, plant and equipment | (433.3) | (524.7) | (477.7)
Proceeds from sale of property, plant and equipment | 5.0 | 4.9 | 2.5
Purchase buyouts of leased equipment | (0.9) | (0.5) | (13.3)
Proceeds from sale of business, net | 141.2 | 47.1 | 5.9
Acquisition of business, net of cash acquired | (9.4) | (1.3) | (895.5)
Investment in affiliates | (9.2) | (3.7) | 0.0
Net cash used in investing activities | (306.6) | (478.2) | (1,378.1)
Financing activities |  |  |
Net short-term proceeds from credit facilities | 0.0 | 0.0 | 4.4
Proceeds from issuance of long-term debt | 356.3 | 509.6 | 2,862.7
Payments of long-term debt, finance lease obligations and other | (545.5) | (681.2) | (2,154.4)
Debt issuance costs | (3.3) | (6.9) | (91.0)
Purchase of noncontrolling interest | 0.0 | (2.3) | 0.0
Employee stock option exercises | 0.0 | 0.0 | 0.9
Purchase of treasury stock | (7.5) | (3.7) | (7.0)
Net cash provided by (used in) financing activities | (200.0) | (184.5) | 615.6
Effect of exchange rate changes on cash | 0.1 | (6.7) | 11.1
Net increase (decrease) in cash, cash equivalents and restricted cash | 53.1 | 102.1 | (104.4)
Cash, cash equivalents and restricted cash at beginning of year | 478.9 | 376.8 | 481.2
Cash, cash equivalents and restricted cash at end of year | 532.0 | 478.9 | 376.8
Supplemental cash flow information |  |  |
Interest paid | 205.4 | 199.7 | 182.7
Income taxes paid, net | 57.1 | 46.0 | 31.9
Non-cash investing activities: AAM common shares issued for acquisition of MPG | 0.0 | 0.0 | 576.7
Twelve year deferred payment obligation at 6% [Member] |  |  |
Supplemental cash flow information |  |  |
Non-cash investing activities: Debt security received for sale of U.S. Casting | $ 60.0 | $ 0.0 | $ 0.0

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