Goodwill and Purchased Intangible Assets - Schedule of Changes in Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Changes in goodwill
Net goodwill at the beginning of the period	$ 1,416.4
Impairment	(38.7)
Foreign currency translation	(8.7)
Acquisitions	1.7
Net goodwill at the end of the period	1,370.7
Access
Changes in goodwill
Net goodwill at the beginning of the period	979.9
Impairment	0.0
Foreign currency translation	(8.7)
Acquisitions	0.0
Net goodwill at the end of the period	971.2
Defense
Changes in goodwill
Net goodwill at the beginning of the period	44.4
Impairment	(38.7)
Foreign currency translation	0.0
Acquisitions	0.0
Net goodwill at the end of the period	5.7
Vocational
Changes in goodwill
Net goodwill at the beginning of the period	392.1
Impairment	0.0
Foreign currency translation	0.0
Acquisitions	1.7
Net goodwill at the end of the period	$ 393.8