Capital Stock (Details) - $ / shares	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Class of Warrant or Right [Line Items]
Common stock authorized (in shares)	150,000,000
Preferred stock authorized (in shares)	4,000,000
Common stock, par value (usd per share)	$ 1.25	$ 1.25	$ 1.25
Preferred stock authorized, par value (in dollars per share)	$ 1.25
Preferred stock, shares issued (in shares)	0