Capital Stock - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Capital Unit [Line Items]
Preferred stock, par value (dollars per share)		$ 50,000		$ 50,000
Cumulative preferred stock (percent)	4.50%	4.50%
Treasury shares, at cost		$ 363,371,000		$ 361,438,000
Common stock, shares authorized (shares)		180,000,000
Common stock, par value (dollars per share)		$ 0
Common stock, shares, outstanding (shares)		39,310,511		39,213,064
Treasury stock, common, shares (shares)		22,770,880		22,868,327
Preferred stock
Capital Unit [Line Items]
Treasury shares, at cost		$ 1,800,000
Cumulative Preferred Stock
Capital Unit [Line Items]
Preferred stock, shares authorized (shares)		100,000
Preferred stock, par value (dollars per share)		$ 50
Cumulative preferred stock (percent)		4.50%
Preferred stock, callable price per share (dollars per share)		$ 52.50
Preferred stock, shares issued (shares)		71,340
Treasury stock, preferred, shares (shares)		52,998
Purchase of treasury shares (shares)		0
Second Cumulative Preferred Voting Stock
Capital Unit [Line Items]
Preferred stock, shares authorized (shares)		1,000,000
Preferred stock, par value (dollars per share)		$ 10
Preferred stock, shares issued (shares)		0
Common Stock
Capital Unit [Line Items]
Purchase of treasury shares (shares)		0	251,408
Common stock, shares issued (shares)				62,081,391
Stock issued during period, new issues (shares)		0	0
Common stock, value, issued (up to)		$ 100,000,000
Treasury stock
Capital Unit [Line Items]
Reissued shares (shares)		125,967	203,619