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Business Segment Information - Schedule of Net Sales by Geographical Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1,796.7	$ 1,990.2	$ 3,491.8	$ 3,793.6
North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,627.9	1,688.4	3,120.7	3,268.6
Europe, Africa and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	103.3	185.4	184.3	327.9
Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	65.5	116.4	186.8	197.1
Intersegment Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	(3.6)	(5.2)	(6.1)	(10.1)
Intersegment Eliminations | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	(3.6)	(5.3)	(6.1)	(10.1)
Intersegment Eliminations | Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues		0.1
Access Equipment
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	693.0	987.6	1,410.9	1,814.1
Access Equipment | Operating Segments
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	693.0	987.6	1,410.9	1,814.1
Access Equipment | Operating Segments | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	553.9	724.0	1,101.0	1,370.2
Access Equipment | Operating Segments | Europe, Africa and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	84.7	163.2	158.9	276.9
Access Equipment | Operating Segments | Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	54.4	100.4	151.0	167.0
Defense
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	614.6	486.2	1,107.2	950.0
Defense | Operating Segments
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	615.0	486.7	1,108.1	950.8
Defense | Operating Segments | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	596.0	465.6	1,081.5	913.8
Defense | Operating Segments | Europe, Africa and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	17.7	21.0	23.8	36.9
Defense | Operating Segments | Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1.3	0.1	2.8	0.1
Defense | Intersegment Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	0.4	0.5	0.9	0.8
Fire and Emergency
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	253.4	279.0	513.4	570.2
Fire and Emergency | Operating Segments
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	255.6	283.2	518.0	578.7
Fire and Emergency | Operating Segments | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	247.6	274.0	491.5	547.0
Fire and Emergency | Operating Segments | Europe, Africa and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	0.3	0.9	0.7	11.9
Fire and Emergency | Operating Segments | Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	7.7	8.3	25.8	19.8
Fire and Emergency | Intersegment Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	2.2	4.2	4.6	8.5
Commercial
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	235.0	237.1	458.9	458.7
Commercial | Operating Segments
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	236.7	237.9	460.9	460.1
Commercial | Operating Segments | North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	234.0	230.1	452.8	447.7
Commercial | Operating Segments | Europe, Africa and Middle East
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	0.6	0.3	0.9	2.2
Commercial | Operating Segments | Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	2.1	7.5	7.2	10.2
Commercial | Intersegment Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 1.7	$ 0.8	$ 2.0	$ 1.4

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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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