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Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | $ 27.0 | $ 159.9 | $ 107.6 | $ 104.0
Capital expenditures |  | 43.2 | 329.9 | 279.7 | 114.8
Operating Segments | Access |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization | [1] | 9.1 | 55.1 | 37.4 | 37.9
Capital expenditures | [2] | 17.2 | 112.3 | 65.7 | 55.8
Operating Segments | Defense |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 7.9 | 36.6 | 29.9 | 27.8
Capital expenditures |  | 12.1 | 141.4 | 168.2 | 23.8
Operating Segments | Vocational |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 5.9 | 52.2 | 25.3 | 23.1
Capital expenditures |  | 12.9 | 73.0 | 42.2 | 29.4
Corporate, Non-segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 4.1 | 16.0 | 15.0 | 15.2
Capital expenditures |  | $ 1.0 | $ 3.2 | $ 3.6 | $ 5.8
[1] | Includes $3.6 million of accelerated depreciation associated with restructuring actions in fiscal 2021.
[2] | Capital expenditures include both the purchase of property, plant and equipment and equipment held for rental.

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