Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Dec. 31, 2015	Jun. 27, 2015
Restructuring Reserve [Roll Forward]
Beginning balance	$ 13.0	$ 3.6	$ 20.7	$ 1.6	$ 3.2
Additional charges	5.8	(0.1)	11.3		1.0
Payments	(6.6)	(1.9)	(24.8)		(2.6)
Non-cash adjustments	0.0	0.0	5.0		0.0
Ending balance	$ 12.2	$ 1.6	$ 12.2	20.7	$ 1.6
Employee severance
Restructuring Cost and Reserve [Line Items]
Business exit costs				7.0
Lease exit
Restructuring Cost and Reserve [Line Items]
Business exit costs				$ 5.2