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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation Plans

Schedule of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted Average	​	​	​
​	​	​	​	​		​	Remaining	​	Aggregate
​	​	Option	​	Weighted Average		​	Contractual Term	​	Intrinsic Value
Stock Options		Shares		Exercise Price			(in years)		(in millions)
Outstanding at January 1, 2017	​	180,680	​	$	52.61	​	​	​	​	​
Exercised	​	(98,405)	​	​	52.41	​	​	​	​	​
Expired or forfeited	​	(7,000)	​	​	58.68	​	​	​	​	​
Outstanding at December 31, 2017	​	75,275	​	​	52.30	​	​	​	​	​
Exercised	​	(48,275)	​	​	57.91	​	​	​	​	​
Expired or forfeited	​	(1,000)	​	​	55.73	​	​	​	​	​
Outstanding at December 31, 2018	​	26,000	​	​	41.76	​	​	​	​	​
Exercised	​	(20,000)	​	​	40.80	​	​	​	​	​
Outstanding at December 31, 2019	​	6,000	​	$	44.99	​	0.4	​	$	0.4
Exercisable at December 31, 2019	​	6,000	​	$	44.99	​	0.4	​	$	0.4

Summary of certain information concerning outstanding and exercisable options

​

​	​	​	​	​	​	​	​
​	​	​	​	Weighted Average	​	​	​
​	​	Outstanding and	​	Remaining	​	Weighted Average
Range of	​	Exercisable at	​	Contractual Term	​	Exercise Price
Exercise Price		December 31, 2019		(in years)		Per Share
$44 - $45	​	6,000	​	0.4	​	$	44.99
​	​	​	​	​	​	​	​

Summary of the status of the Company's restricted stock units and changes during the year

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	​	​	Average
​	​	​	​	Grant Date
​	​	​	​	Fair Value
Unvested RSUs	​	Shares		Per RSU
Unvested at January 1, 2019	​	889,830	​	$	82.05
Granted	​	488,345	​	​	88.05
Vested	​	(476,634)	​	​	80.18
Canceled or forfeited	​	(42,536)	​	​	83.97
Unvested at December 31, 2019	​	859,005	​	$	86.40

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- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock and restricted stock units.

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- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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