Segment Disclosures - Segment Revenue Per Service (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Revenue from Services
Segment Revenue from Services	$ 1,247.8	$ 1,351.0	$ 3,972.4	$ 4,056.6
Less: Intersegment revenue
Revenue from Services
Segment Revenue from Services	(13.0)	(14.8)	(39.4)	(49.3)
Total Americas Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	843.3	858.3	2,605.9	2,630.0
Total EMEA Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	239.3	242.6	696.6	699.8
Total APAC Commercial and PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	0.0	93.1	189.0	289.8
Americas Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	603.7	615.5	1,887.6	1,908.2
Americas PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	239.6	242.8	718.3	721.8
EMEA Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	197.6	199.0	570.2	573.0
EMEA PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	41.7	43.6	126.4	126.8
APAC Commercial | Reporting Segments
Revenue from Services
Segment Revenue from Services	0.0	83.2	170.7	259.1
APAC PT | Reporting Segments
Revenue from Services
Segment Revenue from Services	0.0	9.9	18.3	30.7
OCG | Reporting Segments
Revenue from Services
Segment Revenue from Services	$ 178.2	$ 171.8	$ 520.3	$ 486.3