Net Earnings Per Share - Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Sep. 27, 2019	Sep. 28, 2018
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	$ 23.5	$ 23.4	$ 23.4	$ 24.5	$ 24.4	$ 24.3	$ 70.3	$ 73.2
Dividend per share on MCPS (in dollars per share)	$ 12.50	$ 12.50	$ 12.50	$ 12.78	$ 0	$ 0	$ 37.50	$ 12.78
Amount, MCPS	$ 17.3	$ 17.2	$ 17.3	$ 17.6	$ 0.0	$ 0.0	$ 51.8	$ 17.6