Share-Based Compensation Share Based Compensation (Performance Shares Rollforward) (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding and unvested, beginning balance, in shares	609,026	801,956	1,018,472
Weighted average grant date fair value, beginning of Period, in dollars per share	$ 165.02	$ 131.14	$ 99.53
Share based compensation (SARs or Performance shares), granted, in shares	208,046	195,930	284,300
Weighted average grant date fair value, granted, in dollars per share	$ 207.23	$ 170.31	$ 181.84
Performance shares, vested in period, in shares	(237,586)	(346,540)	(419,088)
Performance shares, vested, weighted average grant date fair value	$ 147.33	$ 89.70	$ 82.93
Share based compensation (SARs or Performance shares), cancelled, in shares	(20,526)	(42,320)	(81,728)
Weighted average grant date fair value, cancelled, in dollars per share	$ 186.32	$ 164.21	$ 160.86
Outstanding and unvested, ending balance, in shares	558,960	609,026	801,956
Weighted average grant date fair value, end of Period, in dollars per share	$ 187.47	$ 165.02	$ 131.14