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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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