Leases - Right of Use Asset Balance for Operating Leases Disaggregated by Segment and Type of Lease (Details) $ in Millions	Sep. 30, 2020 USD ($)
Lessee Lease Description [Line Items]
Right of use asset balance	$ 149.0
Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	68.7
Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	32.4
Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	8.7
Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	19.8
Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	19.4
Real Estate Leases
Lessee Lease Description [Line Items]
Right of use asset balance	121.0
Real Estate Leases | Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	61.4
Real Estate Leases | Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	28.2
Real Estate Leases | Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	6.5
Real Estate Leases | Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	17.9
Real Estate Leases | Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	7.0
Equipment Leases
Lessee Lease Description [Line Items]
Right of use asset balance	28.0
Equipment Leases | Operating Segments | Access Equipment
Lessee Lease Description [Line Items]
Right of use asset balance	7.3
Equipment Leases | Operating Segments | Defense
Lessee Lease Description [Line Items]
Right of use asset balance	4.2
Equipment Leases | Operating Segments | Fire & Emergency
Lessee Lease Description [Line Items]
Right of use asset balance	2.2
Equipment Leases | Operating Segments | Commercial
Lessee Lease Description [Line Items]
Right of use asset balance	1.9
Equipment Leases | Corporate and Intersegment Eliminations
Lessee Lease Description [Line Items]
Right of use asset balance	$ 12.4