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Stock-Based Compensation (Stock Appreciation Rights Outstanding and Exercisable) (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 8 months 12 days |
Stock Appreciation Rights Outstanding, Shares | 292,500 | 487,900
Stock Appreciation Rights Exercisable, Shares | 214,400 |
$34.06 to $46.78 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 214.63 |
Stock Appreciation Rights Outstanding, Shares | 53,900 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 1 year 7 months 6 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 12.7 |
Stock Appreciation Rights Exercisable, Shares | 53,900 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 1 year 7 months 6 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 12.7 |
Range of Exercise Prices per Share, lower range limit | $ 156.94 |
$51.11 to $81.14 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 278.00 |
Stock Appreciation Rights Outstanding, Shares | 93,400 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 3 years 6 months 7 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 16.8 |
Stock Appreciation Rights Exercisable, Shares | 93,400 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 3 years 6 months 7 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 16.8 |
Range of Exercise Prices per Share, lower range limit | $ 257.08 |
$92.64 to $126.31 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Range of Exercise Prices per Share, upper range limit | $ 328.65 |
Stock Appreciation Rights Outstanding, Shares | 145,200 |
Stock Appreciation Rights Outstanding, Weighted-Average Remaining Contractual Term (in years) | 5 years 7 months 9 days |
Stock Appreciation Rights Outstanding, Aggregate Intrinsic Value | $ 23.4 |
Stock Appreciation Rights Exercisable, Shares | 67,100 |
Stock Appreciation Rights Exercisable, Weighted-Average Remaining Contractual Life (in years) | 5 years 5 months 8 days |
Stock Appreciation Rights Exercisable, Aggregate Intrinsic Value | $ 10.0 |
Range of Exercise Prices per Share, lower range limit | $ 259.56 |

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