Segment Disclosures - Segment Revenue Per Service (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Revenue from Services
Segment Revenue from Services	$ 1,375.5	$ 1,385.0	$ 2,724.6	$ 2,705.6
Less: Intersegment revenue
Revenue from Services
Segment Revenue from Services	(12.6)	(16.7)	(26.4)	(34.5)
Total Americas Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	876.9	897.5	1,762.6	1,771.7
Total EMEA Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	240.2	238.6	457.3	457.2
Total APAC Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	97.1	100.6	189.0	196.7
Americas Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	635.3	651.3	1,283.9	1,292.7
Americas PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	241.6	246.2	478.7	479.0
EMEA Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	197.1	195.7	372.6	374.0
EMEA PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	43.1	42.9	84.7	83.2
APAC Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	87.9	90.3	170.7	175.9
APAC PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	9.2	10.3	18.3	20.8
OCG | Reporting Segments
Revenue from Services
Segment Revenue from Services	$ 173.9	$ 165.0	$ 342.1	$ 314.5