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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
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2021
Operating income (loss): |  |  |  |  |
Operating income (loss) |  | $ 41.6 | $ 837.6 | $ 372.3 | $ 592.1
Interest expense, net of interest income |  | (11.8) | (53.8) | (43.9) | (44.7)
Miscellaneous, net | [1] | (5.6) | 13.8 | (52.8) | (2.1)
Income before income taxes and earnings (losses) of unconsolidated affiliates |  | 24.2 | 797.6 | 275.6 | 545.3
Operating Segments | Access |  |  |  |  |
Operating income (loss): |  |  |  |  |
Operating income (loss) | [2] | 38.2 | 738.8 | 313.2 | 278.2
Operating Segments | Defense |  |  |  |  |
Operating income (loss): |  |  |  |  |
Operating income (loss) | [3] | 16.0 | 91.6 | 46.2 | 200.7
Operating Segments | Vocational |  |  |  |  |
Operating income (loss): |  |  |  |  |
Operating income (loss) | [4] | 18.3 | 185.5 | 154.4 | 260.6
Corporate, Non-segment |  |  |  |  |
Operating income (loss): |  |  |  |  |
Operating income (loss) |  | $ (30.9) | $ (178.3) | $ (141.5) | $ (147.4)
[1] | Results for 2023 include a gain of $4.7 million on the settlement of a claim with the Company's pension advisor. Results for 2022 include a $33.6 million charge from the settlement of a frozen pension plan.
[2] | Results for 2022 include expense of $4.6 million to eliminate cumulative translation adjustments upon liquidation of foreign entities. Results for fiscal 2021 include $3.1 million of restructuring costs and $7.4 million operating expenses related to restructuring plans.
[3] | Results for 2023 include a gain of $8.0 million on the sale of the snow removal apparatus business. Results for 2022 include a $5.6 million intangible asset impairment charge.
[4] | Results for 2023 include a loss of $13.3 million on the sale of the rear discharge mixer business, acquisition costs of $12.9 million related to the acquisition of AeroTech, $7.1 million of amortization of inventory fair value step-up and restructuring costs of $3.0 million. Results for 2022 include a $2.1 million intangible asset impairment charge.

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