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Share and Unit-based Plans - Stock Option Activity (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options
Balance at beginning of year (in shares)	37,515	35,565	35,565
Granted (in shares)	0	1,950	0
Balance at end of year (in shares)	37,515	37,515	35,565
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 54.34	$ 57.32	$ 57.32
Granted (in dollars per share)	0	0	0
Balance at end of year (in dollars per share)	$ 54.34	$ 54.34	$ 57.32

X

- Definition

Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification
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