Segment Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Segment Reporting Information [Line Items]
Segment operating income	$ 156.9	$ 140.9
Depreciation expense	10.0	10.3
Operating segment
Segment Reporting Information [Line Items]
Segment revenue	993.7	886.7
Segment operating income	262.9	233.6
Depreciation expense	5.7	5.9
Buildings and Infrastructure | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	397.6	343.1
Segment operating income	120.7	96.4
Depreciation expense	1.6	1.8
Geospatial | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	207.5	181.7
Segment operating income	57.9	48.7
Depreciation expense	1.6	1.7
Resources and Utilities | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	229.9	205.2
Segment operating income	75.1	80.1
Depreciation expense	1.5	1.5
Transportation | Operating segment
Segment Reporting Information [Line Items]
Segment revenue	158.7	156.7
Segment operating income	9.2	8.4
Depreciation expense	$ 1.0	$ 0.9