CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) (Parenthetical) - $ / shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends paid per common share (in dollars per share)	$ 0.48	$ 0.47
Preferred stock, par value per share	$ 100		$ 100
Preferred stock, shares authorized	100,000		100,000
Preferred stock, shares issued	0		0
Common stock, par value per share	$ 1		$ 1

Aggregate dividends paid during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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