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Share-Based Compensation and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary Of Share Incentive Plans

A summary of activity under our share incentive plans for the year ended December 31, 2021 is shown below:

						Nonvested Share Awards Outstanding						Weighted Average Exercise  / Grant Price
Nonvested share awards outstanding at December 31, 2020						239,728						$	103.48
Granted						188,636						105.87
Exercised/Vested						(231,661)						101.97
Forfeited						(12,575)						107.41
Total nonvested share awards outstanding at December 31, 2021						184,128						$	107.57

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

The following table presents information related to our ESPP:

			2021						2020						2019
Shares purchased			29,857						22,496						22,032
Weighted average fair value of shares purchased			$	141.64					$	95.97					$	105.93
Expense recorded (in millions)			$	1.2					$	0.3					$	0.4

Temporary Equity [Table Text Block]

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- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of employee stock purchase plan activity.

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Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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