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Share-Based Compensation Plans - Performance Share Units (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Performance Shares
Payout Levels (in units):
Threshold Award (in shares)	39,882	59,698	61,381	42,361
Target Award (in shares)	79,763	119,395	122,761	84,726
Outstanding Award (in shares)	159,526	238,790	245,522	169,452
Shares Issued (in shares)				42,365
Payout Achieved Over Performance Period			81,700
Performance Shares 1
Payout Levels (in units):
Threshold Award (in shares)	61,076
Target Award (in shares)	122,152
Outstanding Award (in shares)	244,304

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- Definition

In the event the performance criteria exceeds the target performance level, an additional number of shares, up to the Outstanding Award level, may be granted.

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Payout levels.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Achieved Over Performance Period

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- Definition

Number of shares under an equity-based award plan, other than a stock option plan, that were issued during the reporting period.

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In the event the performance criteria meets the target performance level, the number of shares, up to the Target Award level, may be granted.

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- Definition

In the event the performance criteria falls below the target performance level, a reduced number of shares, as low as the Threshold Award level, may be granted.

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