Segment Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Segment operating income	$ 121.3	$ 122.4	$ 351.9	$ 414.2
Operating segment
Segment Reporting Information [Line Items]
Segment revenue	957.3	884.9	2,866.3	2,819.8
Segment operating income	276.4	238.4	794.5	745.3
Buildings and Infrastructure | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	395.1	363.6	1,204.6	1,143.8
Segment operating income	113.5	96.7	332.6	318.8
Geospatial | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	180.7	184.2	526.0	585.4
Segment operating income	57.9	61.5	162.3	177.2
Resources and Utilities | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	184.9	191.7	589.5	636.4
Segment operating income	69.2	64.2	209.6	212.3
Transportation | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	196.6	145.4	546.2	454.2
Segment operating income	$ 35.8	$ 16.0	$ 90.0	$ 37.0