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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 1,695.1 | $ 1,803.4
Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | (2.5) | (4.9)
Transferred at Point in Time |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 1,064.1 | 1,215.3
Transferred at Point in Time | Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | (3.1) | (4.9)
Transferred over Time |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 631.0 | 588.1
Transferred over Time | Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 0.6 |
Access Equipment |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 717.9 | 826.5
Access Equipment | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 717.9 | 826.5
Access Equipment | Transferred at Point in Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 695.3 | 807.8
Access Equipment | Transferred over Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 22.6 | 18.7
Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 492.6 | 463.8
Defense | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 493.1 | 464.1
Defense | Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 0.5 | 0.3
Defense | Transferred at Point in Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 0.5 | 0.3
Defense | Transferred over Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 492.6 | 463.8
Fire and Emergency |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 260.0 | 291.2
Fire and Emergency | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 262.4 | 295.5
Fire and Emergency | Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 2.4 | 4.3
Fire and Emergency | Transferred at Point in Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 252.0 | 290.9
Fire and Emergency | Transferred over Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 10.4 | 4.6
Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 223.9 | 221.6
Commercial | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 224.2 | 222.2
Commercial | Intersegment Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 0.3 | 0.6
Commercial | Transferred at Point in Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 119.4 | 121.2
Commercial | Transferred over Time | Operating Segments |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 104.8 | $ 101.0

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