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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 1,796.7 | $ 1,990.2 | $ 3,491.8 | $ 3,793.6
Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | (3.6) | (5.2) | (6.1) | (10.1)
Transferred at Point in Time |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 1,027.9 | 1,387.5 | 2,092.0 | 2,602.8
Transferred at Point in Time | Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | (4.3) | (5.2) | (7.4) | (10.1)
Transferred over Time |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 768.8 | 602.7 | 1,399.8 | 1,190.8
Transferred over Time | Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 0.7 |  | 1.3 |
Access Equipment |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 693.0 | 987.6 | 1,410.9 | 1,814.1
Access Equipment | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 693.0 | 987.6 | 1,410.9 | 1,814.1
Access Equipment | Transferred at Point in Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 670.8 | 968.9 | 1,366.1 | 1,776.7
Access Equipment | Transferred over Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 22.2 | 18.7 | 44.8 | 37.4
Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 614.6 | 486.2 | 1,107.2 | 950.0
Defense | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 615.0 | 486.7 | 1,108.1 | 950.8
Defense | Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 0.4 | 0.5 | 0.9 | 0.8
Defense | Transferred at Point in Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 0.4 | 1.4 | 0.9 | 1.7
Defense | Transferred over Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 614.6 | 485.3 | 1,107.2 | 949.1
Fire and Emergency |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 253.4 | 279.0 | 513.4 | 570.2
Fire and Emergency | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 255.6 | 283.2 | 518.0 | 578.7
Fire and Emergency | Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 2.2 | 4.2 | 4.6 | 8.5
Fire and Emergency | Transferred at Point in Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 242.9 | 274.3 | 494.9 | 565.2
Fire and Emergency | Transferred over Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 12.7 | 8.9 | 23.1 | 13.5
Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 235.0 | 237.1 | 458.9 | 458.7
Commercial | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 236.7 | 237.9 | 460.9 | 460.1
Commercial | Intersegment Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 1.7 | 0.8 | 2.0 | 1.4
Commercial | Transferred at Point in Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 118.1 | 148.1 | 237.5 | 269.3
Commercial | Transferred over Time | Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 118.6 | $ 89.8 | $ 223.4 | $ 190.8

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