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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | [1] | Sep. 30, 2022 | [2] | Jun. 30, 2022 | Mar. 31, 2022 | [3] | Dec. 31, 2021 | Sep. 30, 2021 | [4] | Jun. 30, 2021 | [5] | Mar. 31, 2021 | [6] | Dec. 31, 2020 | [7] | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,203.6 | $ 2,066.7 | $ 2,066.0 | $ 1,945.7 | $ 1,791.7 | $ 2,063.0 | $ 2,208.8 | $ 1,889.0 | $ 1,576.5 | $ 8,282.0 | $ 7,737.3 | $ 6,856.8
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 1,791.7 |  |  |  |  | 8,282.0 | 7,737.3 | 6,856.8
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | (2.5) |  |  |  |  | (7.1) | (24.6) | (34.6)
Transferred at Point in Time |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 1,170.6 |  |  |  |  | 5,686.5 | 4,764.0 | 4,078.1
Transferred at Point in Time | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | (2.7) |  |  |  |  | (7.1) | (25.1) | (36.0)
Transferred over Time |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 621.1 |  |  |  |  | 2,595.5 | 2,973.3 | 2,778.7
Transferred over Time | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 0.2 |  |  |  |  |  | 0.5 | 1.4
Access Equipment |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 833.3 |  |  |  |  | 3,971.9 | 3,067.3 | 2,505.7
Access Equipment | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 833.5 |  |  |  |  | 3,972.1 | 3,072.1 | 2,515.1
Access Equipment | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 0.2 |  |  |  |  | 0.2 | 4.8 | 9.4
Access Equipment | Transferred at Point in Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 818.8 |  |  |  |  | 3,923.4 | 3,006.9 | 2,437.5
Access Equipment | Transferred over Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 14.7 |  |  |  |  | 48.7 | 65.2 | 77.6
Defense |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 531.1 |  |  |  |  | 2,139.9 | 2,524.1 | 2,300.4
Defense | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 531.5 |  |  |  |  | 2,141.3 | 2,525.6 | 2,311.5
Defense | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 0.4 |  |  |  |  | 1.4 | 1.5 | 11.1
Defense | Transferred at Point in Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 4.0 |  |  |  |  | 13.0 | 43.5 | 34.8
Defense | Transferred over Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 527.5 |  |  |  |  | 2,128.3 | 2,482.1 | 2,276.7
Fire & Emergency |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 217.0 |  |  |  |  | 1,108.2 | 1,211.6 | 1,098.0
Fire & Emergency | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 218.6 |  |  |  |  | 1,111.6 | 1,226.6 | 1,107.0
Fire & Emergency | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 1.6 |  |  |  |  | 3.4 | 15.0 | 9.0
Fire & Emergency | Transferred at Point in Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 214.7 |  |  |  |  | 1,086.8 | 1,205.9 | 1,085.1
Fire & Emergency | Transferred over Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 3.9 |  |  |  |  | 24.8 | 20.7 | 21.9
Commercial |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 210.2 |  |  |  |  | 1,061.8 | 933.6 | 951.3
Commercial | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 210.6 |  |  |  |  | 1,064.1 | 937.6 | 957.8
Commercial | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 0.4 |  |  |  |  | 2.3 | 4.0 | 6.5
Commercial | Transferred at Point in Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | 135.8 |  |  |  |  | 670.4 | 532.8 | 556.7
Commercial | Transferred over Time | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  | $ 74.8 |  |  |  |  | $ 393.7 | $ 404.8 | $ 401.1
[1] | The fourth quarter of fiscal 2022 was impacted by a $5.6 million ($4.3 million after-tax) intan gible asset impairment charge in the Defense segment and a $33.6 million ($25.7 million after-tax) pension settlement charge.
[2] | The third quarter of fiscal 2022 was impacted by expense of $4.6 million to eliminate cumulative translation adjustments upon liquidation of foreign entities in the Access Equipment segment and a $2.1 million intangible asset impairment charge in the Commercial segment.
[3] | The first quarter of fiscal 2022 was impacted by tax expense of $18.1 million for anti-hybrid tax on prior period income.
[4] | The fourth quarter of the year ended September 30, 2021 was impacted by a tax benefit of $11.7 million for the revaluation of deferred tax liabilities and a tax benefit of $5.4 million for net operating loss carrybacks.
[5] | The third quarter of the year ended September 30, 2021 was impacted a tax benefit of $69.9 million for net operating loss carrybacks and $1.3 million ($1.4 million after-tax) of restructuring-related costs in the Access Equipment segment.
[6] | The second quarter of the year ended September 30, 2021 was impacted by $2.2 million ($2.5 million after-tax) of restructuring-related costs in the Access Equipment segment.
[7] | The first quarter of the year ended September 30, 2021 was impacted by $8.0 million ($7.8 million after-tax) of restructuring-related costs in the Access Equipment segment.

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