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Stock-Based Compensation (Changes in Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ | $ 5.3
Shares |
Outstanding awards as of beginning of period (in shares) | shares | 487,900
Granted (in shares) | shares | 0
Exercised (in shares) | shares | (176,500)
Outstanding awards as of end of period (in shares) | shares | 292,500
Exercisable at end of period (in shares) | shares | 214,400
Weighted-Average Exercise Price per Share |
Outstanding awards as of beginning of period (in usd per share) | $ / shares | $ 247.77
Granted (in usd per share) | $ / shares | 0
Exercised (in usd per share) | $ / shares | 212.53
Outstanding as of end of period (in shares) | $ / shares | 266.57
Exercisable at end of period, Weighted-Average Exercise Price per Share (in usd per share) | $ / shares | $ 263.11
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares | (18,900)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares | $ 285.73

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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