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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 1,580.8	$ 2,392.7	$ 5,072.6	$ 6,186.3
Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(13.1)	(4.6)	(19.2)	(14.7)
Transferred at Point in Time
Disaggregation Of Revenue [Line Items]
Net sales	911.5	1,723.4	3,003.5	4,326.2
Transferred at Point in Time | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(13.2)	(4.6)	(20.6)	(14.7)
Transferred over Time
Disaggregation Of Revenue [Line Items]
Net sales	669.3	669.3	2,069.1	1,860.1
Transferred over Time | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	0.1		1.4
Access Equipment
Disaggregation Of Revenue [Line Items]
Net sales	479.9	1,249.1	1,890.8	3,063.2
Access Equipment | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	488.0	1,249.1	1,898.9	3,063.2
Access Equipment | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	8.1		8.1
Access Equipment | Transferred at Point in Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	472.1	1,231.1	1,838.2	3,007.8
Access Equipment | Transferred over Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	15.9	18.0	60.7	55.4
Defense
Disaggregation Of Revenue [Line Items]
Net sales	547.0	510.6	1,654.2	1,460.6
Defense | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	547.5	511.1	1,655.6	1,461.9
Defense | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	0.5	0.5	1.4	1.3
Defense | Transferred at Point in Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	0.4	0.5	1.3	2.2
Defense | Transferred over Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	547.1	510.6	1,654.3	1,459.7
Fire and Emergency
Disaggregation Of Revenue [Line Items]
Net sales	308.7	336.9	822.1	907.1
Fire and Emergency | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	310.7	341.0	828.7	919.7
Fire and Emergency | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	2.0	4.1	6.6	12.6
Fire and Emergency | Transferred at Point in Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	298.7	319.9	793.6	885.1
Fire and Emergency | Transferred over Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	12.0	21.1	35.1	34.6
Commercial
Disaggregation Of Revenue [Line Items]
Net sales	245.1	295.6	704.0	754.3
Commercial | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	247.7	296.1	708.6	756.2
Commercial | Intersegment Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	2.6	0.5	4.6	1.9
Commercial | Transferred at Point in Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	153.5	176.5	391.0	445.8
Commercial | Transferred over Time | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	$ 94.2	$ 119.6	$ 317.6	$ 310.4

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