Employee Stock and Incentive Plans - Performance Shares and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
		Feb. 28, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Performance Shares [Member]
Stock-based Compensation [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 8 months 12 days
Number of Shares [Rollforward]
As of January 1			80,661	85,284	99,585
Granted	[1]		37,731	33,304	25,763
Awarded			0	0	(25,304)
Unearned Grant Award			(50,524)	(33,375)	(13,625)
Forfeited			(7,379)	(4,552)	(1,135)
As of December 31			60,489	80,661	85,284
Performance Period (Years)			3 years
Weighted-Average Grant Date Fair Value [Abstract]
As of January 1			$ 75.80	$ 80.73	$ 72.78
Granted	[1]		67.22	73.25	83.17
Awarded			0	0	62.03
Unearned Grant Award			77.49	86.09	62.03
Forfeited			71.00	74.05	79.81
As of December 31			$ 69.62	$ 75.80	$ 80.73
Restricted Stock Units [Member]
Stock-based Compensation [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 7 months 6 days
Number of Shares [Rollforward]
As of January 1			28,141	37,482	39,943
Granted	[2]		15,477	16,251	15,169
Awarded			(7,396)	(23,631)	(17,193)
Forfeited			(2,658)	(1,961)	(437)
As of December 31			33,564	28,141	37,482
Performance Period (Years)			3 years
Weighted-Average Grant Date Fair Value [Abstract]
As of January 1			$ 73.16	$ 77.64	$ 69.30
Granted	[2]		63.70	64.97	83.48
Awarded			75.55	74.53	63.41
Forfeited			66.44	74.52	77.52
As of December 31			$ 68.80	$ 73.16	$ 77.64
Subsequent Event [Member] | Performance Shares [Member]
Number of Shares [Rollforward]
Granted		51,000
Awarded		0
Performance Period (Years)		3 years
Granted, Grant Date Fair Value		$ 3.4
Subsequent Event [Member] | Restricted Stock Units [Member]
Number of Shares [Rollforward]
Granted		14,700
Awarded		(8,500)
Granted, Grant Date Fair Value		$ 0.9
Awarded, Grant Date Fair Value		$ 0.7

[1] Shares granted include accrued dividends.

[2] Shares granted include accrued dividends.