Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Gross	$ 2,510.9	$ 2,517.9
Accumulated Impairment	(1,101.5)	(1,101.5)
Net	1,409.4	1,416.4
Access
Goodwill [Line Items]
Gross	1,905.0	1,912.0
Accumulated Impairment	(932.1)	(932.1)
Net	972.9	979.9
Defense
Goodwill [Line Items]
Gross	44.4	44.4
Accumulated Impairment	0.0	0.0
Net	44.4	44.4
Vocational
Goodwill [Line Items]
Gross	561.5	561.5
Accumulated Impairment	(169.4)	(169.4)
Net	$ 392.1	$ 392.1