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Unaudited Quarterly Results - Schedule of Unaudited Quarterly Results (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Pension settlement charge | $ 33.6 |  |  |  |  |  |  |  |  |
Restructuring charge, net of tax | 25.7 |  |  |  |  |  |  |  |  |
Intangible asset impairment charge |  |  |  |  |  |  |  | $ 7.7 |  |
Income tax expense (benefit) related to taxes on income in prior periods |  |  | $ 18.1 |  |  |  |  |  |  |
Tax benefit for revaluation of deferred tax liabilities |  |  |  | $ 11.7 |  |  |  |  |  |
Tax benefit for net operating loss carrybacks |  |  |  | $ 5.4 | $ 69.9 |  |  |  |  |
Valuation allowance on foreign net deferred tax assets benefits (expense) |  |  |  |  |  |  |  |  | $ 11.7 |
Defense |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges | 5.6 |  |  |  |  |  |  |  |  |
Intangible asset impairment charge | $ 4.3 |  |  |  |  |  |  |  |  |
Access Equipment |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 1.3 | $ 2.2 | $ 8.0 | 2.2 | $ 3.1 | $ 10.4
Restructuring charge, net of tax |  |  |  |  | $ 1.4 | $ 2.5 | $ 7.8 |  |  |
Expense to eliminate cumulative translation adjustments upon liquidation of foreign entities |  | $ 4.6 |  |  |  |  |  | $ 4.6 |  |
Commercial |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  | $ 1.5
Intangible asset impairment charge |  | $ 2.1 |  |  |  |  |  |  |  |

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