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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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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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