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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Operating activities: |  |  |  |
Net income | $ 24.2 | $ 173.9 | $ 508.9 | $ 321.5
Depreciation and amortization | 27.0 | 107.6 | 104.0 | 104.2
Intangible asset impairment charge |  | 7.7 |  |
Stock-based incentive compensation | 4.2 | 28.6 | 27.2 | 29.3
Deferred income taxes | (179.5) | (53.5) | 99.8 | 21.5
Gain on sale of assets | (5.6) | (3.8) | (3.6) | (11.8)
Unrealized loss on investments | (5.5) | (12.6) | (0.7) |
Foreign currency transaction (gains) losses | (0.9) | 6.9 | (3.1) | (0.6)
Other non-cash adjustments | 0.3 | 4.3 | 2.3 | 7.9
Changes in operating assets and liabilities: |  |  |  |
Receivables, net | 45.5 | (200.4) | (128.3) | 266.7
Unbilled receivables, net | (19.7) | (146.3) | 62.8 | 65.8
Inventories, net | (139.0) | (330.8) | 199.3 | (242.8)
Other current assets | (13.5) | (11.5) | 8.1 | (17.4)
Accounts payable | (105.6) | 331.7 | 252.1 | (222.5)
Customer advances | 124.9 | 819.3 | 281.3 | 112.3
Payroll-related obligations | (96.7) | 1.5 | 61.2 | (32.3)
Income taxes payable | 190.6 | 71.8 | (156.7) | (52.1)
Other current liabilities | 3.4 | 7.5 | 6.4 | (37.1)
Other long-term assets and liabilities | (28.2) | (225.8) | (100.8) | 14.7
Total changes in operating assets and liabilities | (38.3) | 317.0 | 485.4 | (144.7)
Net cash provided (used) by operating activities | (163.1) | 601.3 | 1,221.6 | 327.3
Investing activities: |  |  |  |
Additions to property, plant and equipment | (39.4) | (269.5) | (104.4) | (112.3)
Additions to equipment held for rental | (3.8) | (10.2) | (10.4) | (17.9)
Acquisition of business, net of cash acquired |  | (19.7) | (110.6) |
Proceeds from sale of equipment held for rental | 14.9 | 13.0 | 16.3 | 38.8
Acquisition of equity securities | (1.2) | (17.4) | (41.0) | (2.9)
Other investing activities | 0.8 | 3.4 | 4.5 | 16.7
Net cash used in investing activities | (28.7) | (300.4) | (245.6) | (77.6)
Financing activities: |  |  |  |
Proceeds from debt (original maturities greater than three months) |  | 10.4 |  | 303.9
Repayments of debt (original maturities greater than three months) |  | (225.0) | (5.2) | (300.0)
Debt issuance costs |  | (2.5) |  | (9.6)
Repurchases of Common Stock | (150.0) | (155.0) | (107.8) | (40.8)
Dividends paid | (24.9) | (97.3) | (90.4) | (81.8)
Proceeds from exercise of stock options | 2.7 | 3.1 | 42.8 | 26.1
Acquisition of Common Stock for taxes on stock-based compensation | (12.0) | (8.3) | (14.3) | (10.7)
Other financing activities | (2.1) | (10.4) | (5.5) | (2.6)
Net cash used in financing activities | (186.3) | (485.0) | (180.4) | (115.5)
Effect of exchange rate changes on cash and cash equivalents | (2.0) | (5.7) | (2.7) | 0.3
Increase (decrease) in cash and cash equivalents | (380.1) | (189.8) | 792.9 | 134.5
Cash and cash equivalents at beginning of period | 1,375.8 | 995.7 | 582.9 | 448.4
Cash and cash equivalents at end of period | 995.7 | 805.9 | 1,375.8 | 582.9
Supplemental disclosures: |  |  |  |
Cash paid for interest | 12.2 | 49.6 | 45.2 | 55.9
Cash paid for income taxes | 2.7 | 257.3 | 153.9 | 157.2
Cash received from income tax refunds | 7.5 | 250.8 | 26.6 |
Cash paid for operating lease liabilities | 12.2 | 49.8 | 51.4 | 55.8
Operating right-of-use assets obtained | $ 20.6 | $ 56.0 | $ 92.5 | $ 23.3

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