Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Goodwill [Line Items]
Gross	$ 2,607.3	$ 2,145.8
Accumulated Impairment	(1,101.5)	(1,103.8)
Net	1,505.8	1,042.0
Access
Goodwill [Line Items]
Gross	1,898.4	1,797.9
Accumulated Impairment	(932.1)	(932.1)
Net	966.3	865.8
Defense
Goodwill [Line Items]
Gross	44.4	44.4
Net	44.4	44.4
Vocational
Goodwill [Line Items]
Gross	664.5	303.5
Accumulated Impairment	(169.4)	(171.7)
Net	$ 495.1	$ 131.8