Restructuring and Other Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Dec. 31, 2014
Restructuring and Other Charges [Abstract]
Reduction in workforce					10.00%
Annualized savings from reduction of workforce		$ 11.5
Restructuring Charges [Abstract]
Restructuring Charges	$ 0.2	10.3	$ 0.5	$ 11.2
Impairment of assets	0.0	18.5	0.0	18.5
Total restructuring and other charges, net	0.2	$ 28.8	0.5	$ 29.7
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning of period			3.6
Additional provisions			0.5
Cash payments			(3.4)
Restructuring liability, ending of period	$ 0.7		$ 0.7