Segment Information - Segment Revenue by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017		Sep. 28, 2018	Sep. 29, 2017
Segment Reporting Information [Line Items]
Revenues	$ 795.2	$ 676.2	[1]	$ 2,322.9	$ 1,946.7	[1]
Buildings and Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenues	286.6	217.9	[1]	785.6	625.0	[1]
Geospatial [Member]
Segment Reporting Information [Line Items]
Revenues	185.4	169.4	[1]	544.3	483.6	[1]
Resources and Utilities [Member]
Segment Reporting Information [Line Items]
Revenues	133.0	117.2	[1]	437.2	349.0	[1]
Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	190.2	171.7	[1]	555.8	489.1	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	804.7	676.9	[2]	2,339.1	1,948.2	[2]
Operating Segments [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenues	451.4	366.5	[2]	1,251.5	1,052.8	[2]
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	203.5	168.1	[2]	653.5	495.8	[2]
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	110.8	99.2	[2]	312.7	273.8	[2]
Operating Segments [Member] | Rest of World [Member]
Segment Reporting Information [Line Items]
Revenues	39.0	43.1	[2]	121.4	125.8	[2]
Operating Segments [Member] | Buildings and Infrastructure [Member]
Segment Reporting Information [Line Items]
Revenues	295.8	218.0	[2]	800.7	625.4	[2]
Operating Segments [Member] | Buildings and Infrastructure [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenues	167.8	111.9	[2]	433.2	326.8	[2]
Operating Segments [Member] | Buildings and Infrastructure [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	77.7	60.1	[2]	236.9	180.3	[2]
Operating Segments [Member] | Buildings and Infrastructure [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	45.0	37.1	[2]	111.6	91.9	[2]
Operating Segments [Member] | Buildings and Infrastructure [Member] | Rest of World [Member]
Segment Reporting Information [Line Items]
Revenues	5.3	8.9	[2]	19.0	26.4	[2]
Operating Segments [Member] | Geospatial [Member]
Segment Reporting Information [Line Items]
Revenues	185.4	169.4	[2]	544.3	483.6	[2]
Operating Segments [Member] | Geospatial [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenues	83.4	74.9	[2]	223.0	194.3	[2]
Operating Segments [Member] | Geospatial [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	48.8	44.1	[2]	154.6	131.5	[2]
Operating Segments [Member] | Geospatial [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	42.2	39.4	[2]	130.4	119.4	[2]
Operating Segments [Member] | Geospatial [Member] | Rest of World [Member]
Segment Reporting Information [Line Items]
Revenues	11.0	11.0	[2]	36.3	38.4	[2]
Operating Segments [Member] | Resources and Utilities [Member]
Segment Reporting Information [Line Items]
Revenues	133.2	117.6	[2]	438.0	349.6	[2]
Operating Segments [Member] | Resources and Utilities [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenues	43.5	37.4	[2]	140.3	125.1	[2]
Operating Segments [Member] | Resources and Utilities [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	55.3	45.4	[2]	197.6	131.9	[2]
Operating Segments [Member] | Resources and Utilities [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	12.1	13.4	[2]	35.7	35.7	[2]
Operating Segments [Member] | Resources and Utilities [Member] | Rest of World [Member]
Segment Reporting Information [Line Items]
Revenues	22.3	21.4	[2]	64.4	56.9	[2]
Operating Segments [Member] | Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	190.3	171.9	[2]	556.1	489.6	[2]
Operating Segments [Member] | Transportation [Member] | North America [Member]
Segment Reporting Information [Line Items]
Revenues	156.7	142.3	[2]	455.0	406.6	[2]
Operating Segments [Member] | Transportation [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Revenues	21.7	18.5	[2]	64.4	52.1	[2]
Operating Segments [Member] | Transportation [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenues	11.5	9.3	[2]	35.0	26.8	[2]
Operating Segments [Member] | Transportation [Member] | Rest of World [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0.4	$ 1.8	[2]	$ 1.7	$ 4.1	[2]

[1] See Note 2 for a summary of adjustments

[2] Adjusted to reflect adoption of the new revenue recognition standard, Revenue from Contracts with Customers. For further information, see Note 2.