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Business Segment Information - Schedule of Depreciation, Amortization and Capital Expenditure by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | $ 104.0 | $ 104.2 | $ 115.2
Capital expenditures |  | 114.8 | 130.2 | 174.2
Operating Segments | Access Equipment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [1] | 37.9 | 42.1 | 58.2
Capital expenditures | [2] | 55.8 | 56.5 | 61.4
Operating Segments | Defense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [3] | 27.8 | 20.1 | 17.8
Capital expenditures | [3] | 23.8 | 32.4 | 32.0
Operating Segments | Fire & Emergency |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [3] | 10.0 | 10.0 | 9.0
Capital expenditures | [3] | 8.1 | 6.7 | 12.2
Operating Segments | Commercial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [4] | 13.1 | 17.1 | 12.4
Capital expenditures | [2] | 21.3 | 18.9 | 18.1
Corporate, Non-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | 15.2 | 14.9 | 17.8
Capital expenditures | [5] | $ 5.8 | $ 15.7 | $ 50.5
[1] | Includes $3.6 million and $2.8 million of accelerated depreciation associated with restructuring actions in fiscal 2021 and fiscal 2020, respectively.
[2] | Capital expenditures include both the purchase of property, plant and equipment and equipment held for rental.
[3] | Results for fiscal 2020 and fiscal 2019 have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.
[4] | Includes $4.1 million of accelerated depreciation associated with restructuring actions in fiscal 2020.
[5] | Capital expenditures include capital spending for the construction of the Company’s new global headquarters in fiscal 2019.

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