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Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Gross | $ 2,153.7 | $ 2,119.5 |
Accumulated Impairment | (1,101.7) | (1,110.0) |
Net | 1,052.0 | 1,009.5 | $ 995.7
Access Equipment |  |  |
Goodwill [Line Items] |  |  |
Gross | 1,812.7 | 1,814.7 |
Accumulated Impairment | (932.1) | (932.1) |
Net | 880.6 | 882.6 | 868.8
Defense |  |  |
Goodwill [Line Items] |  |  |
Gross | 44.4 |  |
Net | 44.4 |  |
Fire & Emergency |  |  |
Goodwill [Line Items] |  |  |
Gross | 108.1 | 108.1 |
Accumulated Impairment | (2.0) | (2.0) |
Net | 106.1 | 106.1 | 106.1
Commercial |  |  |
Goodwill [Line Items] |  |  |
Gross | 188.5 | 196.7 |
Accumulated Impairment | (167.6) | (175.9) |
Net | $ 20.9 | $ 20.8 | $ 20.8

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