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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | $ 104.2 | $ 115.2 | $ 120.5
Capital expenditures |  | 130.2 | 174.2 | 100.1
Operating Segments | Access Equipment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [1] | 42.1 | 58.2 | 61.1
Capital expenditures | [2] | 56.5 | 61.4 | 34.2
Operating Segments | Defense |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | 20.1 | 17.3 | 15.2
Capital expenditures |  | 32.3 | 31.4 | 29.1
Operating Segments | Fire & Emergency |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | 10.0 | 9.5 | 9.5
Capital expenditures |  | 6.8 | 12.8 | 12.8
Operating Segments | Commercial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | [3] | 17.1 | 12.4 | 12.9
Capital expenditures | [2] | 18.9 | 18.1 | 12.0
Corporate, Non-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization |  | 14.9 | 17.8 | 21.8
Capital expenditures | [4] | $ 15.7 | $ 50.5 | $ 12.0
[1] | Includes $2.8 million of accelerated deprecation associated with restructuring actions in fiscal 2020.
[2] | Capital expenditures include both the purchase of property, plant and equipment and equipment held for rental.
[3] | Includes $4.1 million of accelerated deprecation associated with restructuring actions in fiscal 2020.
[4] | Capital expenditures include capital spending for the construction of the Company’s new global headquarters.

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