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Goodwill and Purchased Intangible Assets - Goodwill Allocated to Reportable Segments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Gross	$ 2,517.9	$ 2,145.8
Accumulated Impairment	(1,101.5)	(1,103.8)
Net	1,416.4	1,042.0	$ 1,049.0
Access
Goodwill [Line Items]
Gross	1,912.0	1,797.9
Accumulated Impairment	(932.1)	(932.1)
Net	979.9	865.8	877.6
Defense
Goodwill [Line Items]
Gross	44.4	44.4
Net	44.4	44.4	44.4
Vocational
Goodwill [Line Items]
Gross	561.5	303.5
Accumulated Impairment	(169.4)	(171.7)
Net	$ 392.1	$ 131.8	$ 127.0

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