Share-Based Compensation (Summary of Performance Share Units Grant-Date Fair Values and their Related Assumptions) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award Line Items
Grant-date fair value	$ 51.38
Risk-free interest rate	4.15%	1.81%	0.18%
Volatility factor	61.43%	70.10%	67.80%
Contractual term (years)	2 years 10 months 20 days	2 years 10 months 20 days	2 years 10 months 20 days
Including Performance Factor Shares Granted [Member]
Share Based Compensation Arrangement By Share Based Payment Award Line Items
Grant-date fair value	$ 81.7	$ 68.68	$ 18.08