Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings (Loss) Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]
Net earnings	$ 263,861	$ 265,583	$ 211,668	$ 401,905
Basic [Abstract]
Average shares outstanding (in shares)	127,161	125,170	125,982	125,204
Equivalent shares (basic) (in shares)	127,161	125,170	125,982	125,204
Net earnings per common share-basic (in dollars per share)	$ 2.08	$ 2.12	$ 1.68	$ 3.21
Diluted [Abstract]
Average shares outstanding (in shares)	127,161	125,170	125,982	125,204
Effect of dilutive securities:
Options and other share-based awards (in shares)	731	1,980	792	2,044
Equivalent shares (diluted) (in shares)	127,892	127,150	126,774	127,248
Net earnings per common share-diluted (in dollars per share)	$ 2.06	$ 2.09	$ 1.67	$ 3.16
Employee Stock Option and Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to acquire shares totaling excluded as antidilutive	949	450	1,124	514