Segment Reporting (Schedule of Adjusted Operating Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Oct. 03, 2014	Oct. 02, 2015	Oct. 03, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	$ 46.0	$ 11.1	$ 121.5	$ 184.0
Previously allocated stock-based compensation	(12.8)	(11.0)	(37.3)	(32.1)
Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Previously allocated stock-based compensation		(6.3)		(18.8)
Engineering And Construction [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Previously allocated stock-based compensation		(3.6)		(11.0)
Field Solutions [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Previously allocated stock-based compensation		(0.9)		(2.6)
Mobile Solutions [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Previously allocated stock-based compensation		(1.3)		(3.7)
Advanced Devices [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Previously allocated stock-based compensation		(0.5)		(1.5)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	122.2	129.4	350.9	443.3
Operating Segments [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		123.1		424.5
Operating Segments [Member] | Scenario, Adjustment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		129.4		443.3
Operating Segments [Member] | Engineering And Construction [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	68.8	74.2	166.3	231.0
Operating Segments [Member] | Engineering And Construction [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		70.6		220.0
Operating Segments [Member] | Engineering And Construction [Member] | Scenario, Adjustment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		74.2		231.0
Operating Segments [Member] | Field Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	19.5	26.1	85.0	119.4
Operating Segments [Member] | Field Solutions [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		25.2		116.8
Operating Segments [Member] | Field Solutions [Member] | Scenario, Adjustment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		26.1		119.4
Operating Segments [Member] | Mobile Solutions [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	23.1	19.5	62.5	58.5
Operating Segments [Member] | Mobile Solutions [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		18.2		54.8
Operating Segments [Member] | Mobile Solutions [Member] | Scenario, Adjustment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		19.5		58.5
Operating Segments [Member] | Advanced Devices [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income	$ 10.8	9.6	$ 37.1	34.4
Operating Segments [Member] | Advanced Devices [Member] | Scenario, Previously Reported [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		9.1		32.9
Operating Segments [Member] | Advanced Devices [Member] | Scenario, Adjustment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated operating income		$ 9.6		$ 34.4