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Business Segment Information - Schedule of Identifiable Assets by Business Segments and by Geographical Segments (Details) - USD ($) $ in Millions		Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020
Assets
Assets		$ 6,721.8	$ 6,891.6	$ 6,891.6
Fire & Emergency | United States
Assets
Assets		511.2		536.3
Operating Segments | Access Equipment
Assets
Assets		3,155.1		3,033.6
Operating Segments | Access Equipment | United States
Assets
Assets		2,311.8		2,191.3
Operating Segments | Access Equipment | Europe, Africa and Middle East
Assets
Assets		460.3		470.9
Operating Segments | Access Equipment | Rest of the World
Assets
Assets		383.0		371.4
Operating Segments | Defense
Assets
Assets		1,232.2		1,158.3
Operating Segments | Defense | United States
Assets
Assets		1,225.0		1,151.1
Operating Segments | Defense | Rest of the World
Assets
Assets		7.2		7.2
Operating Segments | Commercial
Assets
Assets		424.7		432.6
Operating Segments | Commercial | United States
Assets
Assets		379.6		377.8
Operating Segments | Commercial | Rest of the World
Assets
Assets		45.1		54.8
Corporate, Non-segment | United States
Assets
Assets	[1]	$ 1,398.6		$ 1,730.8
[1] (a)Primarily includes cash and short-term investments and the Company’s global headquarters.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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