Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 12.2	$ 1.7	$ 20.7	$ 3.2
Additional charges	6.6	2.2	17.9	3.1
Payments	(8.6)	(1.9)	(33.3)	(4.5)
Non-cash adjustments	0.1	(0.7)	5.0	(0.5)
Ending balance	10.3	$ 1.3	10.3	$ 1.3
Employee severance [Member]
Restructuring Cost and Reserve [Line Items]
Ending balance	5.1		5.1
Lease exit
Restructuring Cost and Reserve [Line Items]
Ending balance	$ 5.2		$ 5.2