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Capital Stock - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
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 | $ 378,156,000 |  | $ 363,284,000
Common stock, shares authorized (shares) | 180,000,000 |  |
Common stock, shares, outstanding (shares) | 39,349,528 |  | 39,317,212
Treasury stock, common, shares (shares) | 22,731,863 |  | 22,764,179
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 |  | 71,340
Treasury stock, preferred, shares (shares) | 52,998 |  | 52,998
Purchase of treasury shares (shares) | 0 | 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 |  | 0
Common Stock |  |  |
Capital Unit [Line Items] |  |  |
Purchase of treasury shares (shares) | 52,561 | 0 |
Common stock, shares issued (shares) | 62,081,391 |  | 62,081,391
Stock issued during period, new issues (shares) | 0 | 0 |
Common stock, value, issued (up to) | $ 200,000,000.0 |  |
Treasury stock |  |  |
Capital Unit [Line Items] |  |  |
Reissued shares (shares) | 121,790 | 105,894 |

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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