Business Segment Information - Schedule of Identifiable Assets by Business Segments and by Geographical Segments (Details) - USD ($) $ in Millions		Dec. 31, 2019	Sep. 30, 2019
Assets
Assets		$ 5,556.2	$ 5,566.3
Access Equipment | Europe, Africa and Middle East
Assets
Assets		390.5	403.4
Operating Segments | Access Equipment
Assets
Assets		3,043.7	2,973.2
Operating Segments | Access Equipment | United States
Assets
Assets		2,295.8	2,317.2
Operating Segments | Access Equipment | Rest of the World
Assets
Assets	[1]	357.4	252.6
Operating Segments | Defense
Assets
Assets		1,039.2	889.7
Operating Segments | Defense | United States
Assets
Assets		1,032.6	883.0
Operating Segments | Defense | Rest of the World
Assets
Assets		6.6	6.7
Operating Segments | Fire and Emergency | United States
Assets
Assets		569.1	587.9
Operating Segments | Commercial
Assets
Assets		415.5	432.5
Operating Segments | Commercial | United States
Assets
Assets		373.6	383.6
Operating Segments | Commercial | Rest of the World
Assets
Assets		41.9	48.9
Corporate, Non-segment
Assets
Assets		488.7	683.0
Corporate, Non-segment | United States
Assets
Assets	[2]	$ 488.7	597.6
Corporate, Non-segment | Rest of the World
Assets
Assets	[1]		$ 85.4

[1] Control of a shared manufacturing facility in Mexico transferred to the access equipment segment effective October 1, 2019.

[2] Primarily includes cash and short-term investments and the Company’s new global headquarters.