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Net Earnings Per Share Dividends Declared and Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2018
Mar. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 29, 2018
Jun. 30, 2017
Dividends Declared and Paid [Abstract]            
Dividend per Common Share $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.14 $ 0.14
Amount ($ in millions) $ 24.4 $ 24.3 $ 24.3 $ 24.3 $ 48.7 $ 48.6