Condensed Consolidated Stockholders Equity Statement (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Statement of Stockholders' Equity [Abstract]
Adjustments to pension and postretirement liability, tax expense	$ 0.5	$ 0.7	$ 1.6	$ 2.1
Dividends declared per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15