Overview And Accounting Policies (Schedule of Error Corrections and Prior Period Adjustments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Reclassification [Line Items]
Total revenue	$ 915.4	$ 993.7
Amortization of purchased intangible assets	23.0	22.5
Total cost of sales	354.6	444.1
As Previously Reported
Reclassification [Line Items]
Total revenue		993.7
Amortization of purchased intangible assets		22.5
Total cost of sales		444.1
Product
Reclassification [Line Items]
Total revenue	434.4	566.8
Cost of sales:	216.2	306.9
Product | As Previously Reported
Reclassification [Line Items]
Total revenue		621.6
Cost of sales:		308.4
Product | Effect of Change in Presentation
Reclassification [Line Items]
Total revenue		(54.8)
Cost of sales:		(1.5)
Subscription and services
Reclassification [Line Items]
Total revenue	481.0	426.9
Cost of sales:	$ 115.4	114.7
Subscription and services | Effect of Change in Presentation
Reclassification [Line Items]
Total revenue		426.9
Cost of sales:		114.7
Service | As Previously Reported
Reclassification [Line Items]
Total revenue		161.1
Cost of sales:		63.3
Service | Effect of Change in Presentation
Reclassification [Line Items]
Total revenue		(161.1)
Cost of sales:		(63.3)
Subscription | As Previously Reported
Reclassification [Line Items]
Total revenue		211.0
Cost of sales:		49.9
Subscription | Effect of Change in Presentation
Reclassification [Line Items]
Total revenue		(211.0)
Cost of sales:		$ (49.9)