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Share-Based Compensation Plans - Performance Share Units (Details) - Performance Shares - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payout Levels (in units):
Threshold Award (in shares)	68,132	47,003	57,563	65,141
Target Award (in shares)	136,264	94,005	115,125	130,282
Outstanding Award (in shares)	272,528	188,010	230,250	260,564
Shares Issued (in shares)				125,070
Payout Achieved Over Performance Period			88,377

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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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- Definition

Payout levels.

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- Definition

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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- Definition

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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No definition available.

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- Details

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