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Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Goodwill [Line Items] |  |
Gross | $ 2,105.9 | $ 2,105.7
Accumulated Impairment | (1,110.0) | (1,110.0)
Net | 995.9 | 995.7
Access Equipment |  |
Goodwill [Line Items] |  |
Gross | 1,801.2 | 1,800.9
Accumulated Impairment | (932.1) | (932.1)
Net | 869.1 | 868.8
Fire and Emergency |  |
Goodwill [Line Items] |  |
Gross | 108.1 | 108.1
Accumulated Impairment | (2.0) | (2.0)
Net | 106.1 | 106.1
Commercial |  |
Goodwill [Line Items] |  |
Gross | 196.6 | 196.7
Accumulated Impairment | (175.9) | (175.9)
Net | $ 20.7 | $ 20.8

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