Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Restructuring Reserve [Roll Forward]
Beginning balance	$ 51.5	$ 13.0	$ 19.7	$ 20.7
Additional charges	12.1	5.8	50.8	11.3
Payments	(23.6)	(6.6)	(30.7)	(24.8)
Non-cash adjustments	(0.3)	0.0	(0.1)	5.0
Ending balance	39.7	$ 12.2	39.7	$ 12.2
Employee severance [Member]
Restructuring Reserve [Roll Forward]
Ending balance	35.5		35.5
Lease exit
Restructuring Reserve [Roll Forward]
Ending balance	$ 4.2		4.2
CHCA [Member]
Restructuring Reserve [Roll Forward]
Additional charges			$ 28.0