Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Gross	$ 2,510.9	$ 2,517.9
Accumulated Impairment	(1,140.2)	(1,101.5)
Net	1,370.7	1,416.4
Access
Goodwill [Line Items]
Gross	1,903.3	1,912.0
Accumulated Impairment	(932.1)	(932.1)
Net	971.2	979.9
Defense
Goodwill [Line Items]
Gross	44.4	44.4
Accumulated Impairment	(38.7)	0.0
Net	5.7	44.4
Vocational
Goodwill [Line Items]
Gross	563.2	561.5
Accumulated Impairment	(169.4)	(169.4)
Net	$ 393.8	$ 392.1