Net Earnings Per Share Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 28, 2018	Sep. 29, 2017
Earnings Per Share [Abstract]
Dividend per Common Share (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.21	$ 0.21
Amount	$ 24.5	$ 24.4	$ 24.3	$ 24.3	$ 24.3	$ 24.3	$ 73.2	$ 72.8