Stock-based Compensation Plans (Summary of Stock Option Plan Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Outstanding, beginning of period, Shares	1,080,852	1,230,211	1,282,278
Granted, Shares	135,019	140,339	178,040
Exercised, Shares	(56,645)	(279,499)	(225,338)
Forfeited or cancelled, Shares	(22,184)	(10,199)	(4,769)
Outstanding, end of period, Shares	1,137,042	1,080,852	1,230,211
Exercisable, end of period, Shares	864,186	755,953	845,429
Weighted Average Exercise Price
Outstanding, beginning of period, Weighted Average Exercise Price	$ 107.07	$ 99.14	$ 93.64
Granted, Weighted Average Exercise Price	140.01	139.51	115.35
Exercised, Weighted Average Exercise Price	88.1	87.95	80.24
Forfeited or cancelled, Weighted Average Exercise Price	125.15	121.39	118.01
Outstanding, end of period, Weighted Average Exercise Price	111.57	107.07	99.14
Exercisable, end of period, Weighted Average Exercise Price	$ 104.16	$ 98.82	$ 91.1