Net Earnings Per Share - Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 25, 2020	Jun. 26, 2020	Mar. 27, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 25, 2020	Sep. 27, 2019
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, common shares	$ 23.6	$ 23.6	$ 23.5	$ 23.5	$ 23.4	$ 23.4	$ 70.7	$ 70.3
Dividend per share on MCPS (in dollars per share)	$ 12.5	$ 12.5	$ 12.5	$ 12.5	$ 12.5	$ 12.5	$ 37.5	$ 37.5
Amount, MCPS	$ 17.3	$ 17.2	$ 17.3	$ 17.3	$ 17.2	$ 17.3	$ 51.8	$ 51.8