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