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Business Segment Information - Schedule of Income (Loss) from Continuing Operations by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2020 | [1] | Jun. 30, 2020 | [2] | Mar. 31, 2020 | [3] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [4] | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  | $ 127.4 | $ 118.6 | $ 133.6 | $ 109.1 | $ 203.1 | $ 257.8 | $ 175.6 | $ 160.5 | $ 488.7 | $ 797.0 | $ 656.0
Interest expense, net of interest income | [5] |  |  |  |  |  |  |  |  | (51.8) | (47.6) | (55.6)
Miscellaneous other (expense) income | [6] |  |  |  |  |  |  |  |  | 2.2 | 1.3 | (5.8)
Income before income taxes and earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 439.1 | 750.7 | 594.6
Commercial |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Miscellaneous other (expense) income |  |  |  |  |  |  |  |  |  | 6.2 |  |
Operating Segments | Access Equipment |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [7] |  |  |  |  |  |  |  |  | 198.6 | 502.6 | 387.5
Operating Segments | Defense |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [8] |  |  |  |  |  |  |  |  | 183.5 | 203.3 | 225.4
Operating Segments | Fire & Emergency |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [9] |  |  |  |  |  |  |  |  | 151.1 | 176.5 | 137.6
Operating Segments | Commercial |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [10] |  |  |  |  |  |  |  |  | 81.2 | 66.8 | 67.5
Corporate, Non-segment |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [11] |  |  |  |  |  |  |  |  | $ (125.7) | $ (152.2) | $ (162.0)
[1] | The fourth quarter of fiscal 2020 was impacted by restructuring-related charges of $13.0 million ($9.5 million, net of tax) in the Access Equipment, Fire & Emergency and Commercial segments and Corporate, a gain of $4.2 million ($3.2 million, net of tax) for an arbitration settlement in the Defense segment, business interruption insurance proceeds of $18.5 million ($14.2 million, net of tax) in the Commercial segment and a gain on the sale of a business of $3.1 million ($2.8 million net of tax) in the Commercial segment.
[2] | The third quarter of fiscal 2020 was impacted by restructuring charges of $10.2 million ($8.4 million, net of tax) in the Access Equipment, Fire & Emergency and Commercial segments.
[3] | The second quarter of fiscal 2020 was impacted by debt extinguishment costs of $8.5 million ($6.5 million, net of tax) and a tax charge of $11.4 million related to the establishment of a valuation allowance on net operating losses for an entity in Europe.
[4] | The first quarter of fiscal 2019 was impacted by tax expense related to tax reform in the U.S. of $7.0 million.
[5] | Fiscal 2020 results include $8.5 million in debt extinguishment costs and $3.3 million interest income from an arbitration settlement in the Defense segment. Fiscal 2018 results include $9.9 million in debt extinguishment costs.
[6] | Fiscal 2020 results include a $6.2 million gain from insurance proceeds in excess of property loss in the Commercial segment.
[7] | Fiscal 2020 results include $10.4 million of restructuring costs and $4.7 million operating expenses related to restructuring plans. Fiscal 2018 results include $4.7 million of restructuring costs and $24.8 million of operating expenses related to restructuring plans.
[8] | Fiscal 2020 results include reimbursement of $0.9 million of legal costs associated with an arbitration settlement. Fiscal 2018 results include a $19.0 million gain for a litigation settlement (See Note 18 of the Notes to Consolidated Financial Statements for additional details regarding the settlement).
[9] | Fiscal 2020 includes $1.4 million of restructuring costs.
[10] | Fiscal 2020 results include $1.5 million of restructuring costs, $4.1 million of accelerated depreciation related to restructuring actions, a gain of $12.3 million arising from a business interruption insurance recovery and a gain on the sale of a business of $3.1 million. Fiscal 2018 results include $5.4 million of restructuring costs, a business interruption insurance gain of $6.6 million and a loss on the sale of a small product line of $1.4 million
[11] | Fiscal 2020 includes $1.1 million of restructuring costs.

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