Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, Authorized shares (shares)	5,000,000	5,000,000
Preferred stock, unissued shares (shares)	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, Authorized (shares)	200,000,000	200,000,000
Common stock, outstanding (shares)	55,692,544	57,957,912
Treasury (shares)	22,795,428	20,534,652