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Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |
Gross | $ 2,145.8 | $ 2,150.7 | $ 2,153.7 |
Accumulated Impairment | (1,103.8) | (1,101.7) | (1,101.7) |
Net | 1,042.0 | 1,049.0 | 1,052.0 | $ 1,009.5
Access Equipment |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross | 1,797.9 | 1,809.7 | 1,812.7 |
Accumulated Impairment | (932.1) | (932.1) | (932.1) |
Net | 865.8 | 877.6 | 880.6 | 882.6
Defense |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross | 44.4 | 44.4 | 44.4 |
Net | 44.4 | 44.4 | 44.4 |
Fire & Emergency |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross | 115.2 | 108.1 | 108.1 |
Accumulated Impairment | (2.0) | (2.0) | (2.0) |
Net | 113.2 | 106.1 | 106.1 | 106.1
Commercial |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross | 188.3 | 188.5 | 188.5 |
Accumulated Impairment | (169.7) | (167.6) | (167.6) |
Net | $ 18.6 | $ 20.9 | $ 20.9 | $ 20.8

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