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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | $ 27.0 | $ 107.6 | $ 104.0 |  | $ 104.2 |
Capital expenditures |  | 43.2 | 279.7 | 114.8 |  | 130.2 |
Operating Segments | Access Equipment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization | [1] | 9.1 | 37.4 | 37.9 |  | 42.1 |
Capital expenditures | [2] | 17.2 | 65.7 | 55.8 |  | 56.5 |
Operating Segments | Defense |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | 7.9 | 29.9 | 27.8 |  | 20.1 |
Capital expenditures |  | 12.1 | 168.2 | 23.8 |  | 32.4 |
Operating Segments | Fire & Emergency |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | 2.7 | 11.5 | 10.0 |  | 10.0 |
Capital expenditures |  | 6.5 | 30.8 | 8.1 |  | 6.7 |
Operating Segments | Commercial |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization | [3] | 3.2 | 13.8 | 13.1 |  | 17.1 |
Capital expenditures |  | 6.4 | 11.4 | 21.3 | [2] | 18.9 | [2]
Corporate, Non-segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | 4.1 | 15.0 | 15.2 |  | 14.9 |
Capital expenditures |  | $ 1.0 | $ 3.6 | $ 5.8 |  | $ 15.7 |
[1] | Includes $3.6 million and $2.8 million of accelerated depreciation associated with restructuring actions in the years ended September 30, 2021 and 2020, respectively.
[2] | Capital expenditures include both the purchase of property, plant and equipment and equipment held for rental.
[3] | Includes $4.1 million of accelerated depreciation associated with restructuring actions in the year ended September 30, 2020.

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