Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 31, 2014
Restructuring Charges [Abstract]
Reduction in workforce					10.00%
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning of period			$ 14.6
Additional provisions			6.2
Cash payments			(10.9)
Other adjustments			(2.9)
Restructuring liability, end of period	$ 7.0		7.0
Restructuring Charges	5.2	$ 5.8	6.2	$ 11.8
Impairment of Assets	5.3	0.0	21.1	0.0
Total restructuring and other charges	$ 10.5	$ 5.8	$ 27.3	$ 11.8