Business Combinations (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) $ in Millions	12 Months Ended
	Dec. 28, 2018 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 2,287.1	[1]
Additions due to acquisitions and current year acquisitions' purchase price adjustments	1,298.8
Purchase price adjustments - prior years' acquisitions	(1.2)
Foreign currency translation adjustments	(42.9)
Divestitures	(1.8)	[2]
Ending Balance	3,540.0
Building and Infrastructure [Member]
Goodwill [Line Items]
Beginning Balance	706.8
Additions due to acquisitions and current year acquisitions' purchase price adjustments	1,283.4
Purchase price adjustments - prior years' acquisitions	0.0
Foreign currency translation adjustments	(20.0)
Divestitures	0.0	[2]
Ending Balance	1,970.2
Geospatial [Member]
Goodwill [Line Items]
Beginning Balance	415.3
Additions due to acquisitions and current year acquisitions' purchase price adjustments	0.0
Purchase price adjustments - prior years' acquisitions	0.0
Foreign currency translation adjustments	(10.4)
Divestitures	(1.8)
Ending Balance	403.1
Resources and Utilities [Member]
Goodwill [Line Items]
Beginning Balance	314.5
Additions due to acquisitions and current year acquisitions' purchase price adjustments	0.0
Purchase price adjustments - prior years' acquisitions	(0.4)
Foreign currency translation adjustments	(8.4)
Divestitures	0.0	[2]
Ending Balance	305.7
Transportation [Member]
Goodwill [Line Items]
Beginning Balance	850.5
Additions due to acquisitions and current year acquisitions' purchase price adjustments	15.4
Purchase price adjustments - prior years' acquisitions	(0.8)
Foreign currency translation adjustments	(4.1)
Divestitures	0.0	[2]
Ending Balance	$ 861.0

[1] See Note 2 for a summary of adjustments

[2] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmY0MTAzMTMxODNkYzRiZTc5MjlkNmQxOThhNjQxMGM2fFRleHRTZWxlY3Rpb246MTM2MDQzQjA5M0JGRDZGNDZBQzc5MzlFRDgwMTg3MkQM}