Segment Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Segment Reporting Information [Line Items]
Segment operating income	$ 93.6	$ 134.9	$ 230.6	$ 291.8
Operating segment
Segment Reporting Information [Line Items]
Segment revenue	993.6	941.2	1,909.0	1,934.9
Segment operating income	265.0	244.0	518.1	506.9
Buildings and Infrastructure | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	410.0	382.6	809.5	780.2
Segment operating income	105.8	101.4	219.1	222.1
Geospatial | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	192.9	193.7	345.3	401.2
Segment operating income	67.1	57.8	104.4	115.7
Resources and Utilities | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	196.0	214.8	404.6	444.7
Segment operating income	61.3	73.0	140.4	148.1
Transportation | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	194.7	150.1	349.6	308.8
Segment operating income	$ 30.8	$ 11.8	$ 54.2	$ 21.0