Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, shares authorized (in shares)	5,000,000.0	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 10.00	$ 10.00
Common stock, shares authorized (in shares)	125,000,000	125,000,000
Common stock, shares issued (in shares)	55,368,000	54,738,000
Common stock, shares outstanding (in shares)	55,368,000	54,738,000