Capital Stock and Earnings Per Share - Cash Dividends per Common and Preferred Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Quarterly dividend (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07		$ 0.28	$ 0.28
Common Stock, Amount ($ in millions)	$ 23.4	$ 24.5	$ 24.4	$ 24.3	$ 24.3	$ 24.3	$ 24.3	$ 24.3		$ 96.6	$ 97.2
Dividend Per Preferred Share (in dollars per share)	$ 12.50	$ 12.78							$ 25.28
Preferred Stock, Amount ($ in millions)	$ 17.3	$ 17.6							$ 34.9