Stock-Based Compensation (Changes in Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Millions	12 Months Ended
	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