Business Segment Information - Schedule of Income (Loss) from Continuing operations by Product Lines and Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Operating income (loss):
Operating income (loss)		$ 95.9	$ 109.1
Interest expense, net of interest income		(11.4)	(11.8)
Miscellaneous other expense		(1.5)	(0.4)
Income before income taxes and losses of unconsolidated affiliates		83.0	96.9
Operating Segments | Access Equipment
Operating income (loss):
Operating income (loss)	[1]	24.9	69.0
Operating Segments | Defense
Operating income (loss):
Operating income (loss)	[2]	52.8	31.0
Operating Segments | Fire & Emergency
Operating income (loss):
Operating income (loss)	[2]	35.1	30.9
Operating Segments | Commercial
Operating income (loss):
Operating income (loss)		11.9	17.8
Corporate, Non-segment
Operating income (loss):
Operating income (loss)		$ (28.8)	$ (39.6)

[1] Results for the three months ended December 31, 2020 include $4.8 million of restructuring costs and $3.2 million of other costs related to restructuring plans.

[2] Results have been reclassified to reflect the move of the airport snow removal vehicle business from the Fire & Emergency segment to the Defense segment.