Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Gross	$ 2,578.1	$ 2,517.9
Accumulated Impairment	(1,140.2)	(1,101.5)
Net	1,437.9	1,416.4
Access
Goodwill [Line Items]
Gross	1,970.5	1,912.0
Accumulated Impairment	(932.1)	(932.1)
Net	1,038.4	979.9
Vocational
Goodwill [Line Items]
Gross	563.2	561.5
Accumulated Impairment	(169.4)	(169.4)
Net	393.8	392.1
Corporate and Other
Goodwill [Line Items]
Gross	44.4	44.4
Accumulated Impairment	(38.7)	0.0
Net	$ 5.7	$ 44.4