Leases - Right of Use Asset Balance for Operating Leases Disaggregated by Segment and Type of Lease (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Lessee Lease Description [Line Items]
Right of use asset balance	$ 209.2	$ 204.5	$ 194.7
Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	80.8	96.9	89.8
Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	46.8	54.4	57.6
Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	11.1	13.7	7.9
Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	54.4	19.1	18.4
Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	16.1	20.4	21.0
Real Estate Leases
Lessee Lease Description [Line Items]
Right of use asset balance	195.4	185.7	174.2
Real Estate Leases | Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	77.2	92.4	84.3
Real Estate Leases | Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	45.7	52.6	55.6
Real Estate Leases | Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	10.0	12.2	6.2
Real Estate Leases | Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	52.9	16.9	15.9
Real Estate Leases | Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	9.6	11.6	12.2
Equipment Leases
Lessee Lease Description [Line Items]
Right of use asset balance	13.8	18.8	20.5
Equipment Leases | Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	3.6	4.5	5.5
Equipment Leases | Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	1.1	1.8	2.0
Equipment Leases | Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	1.1	1.5	1.7
Equipment Leases | Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	1.5	2.2	2.5
Equipment Leases | Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	$ 6.5	$ 8.8	$ 8.8