Inventories Long term contracts percentage-of-completion accounting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Inventory Disclosure [Abstract]
Net increase (decrease) in operating income from the quarterly impact of revisions in contracts	$ (0.1)	$ (0.3)	$ (2.8)	$ (1.8)