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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2018 | ​ | 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 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (6,000) | ​ | ​ | 44.99 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2020 | ​ | — | ​ | $ | — | ​ | — | ​ | $ | —
Exercisable at December 31, 2020 | ​ | — | ​ | $ | — | ​ | — | ​ | $ | —
Summary of the status of the Company's restricted stock units and changes during the year | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | Aggregate
​ | ​ | ​ | ​ | Fair Value | ​ | ​ | Fair Value
Unvested RSUs | ​ | Shares |  | Per RSU | ​ | ​ | (in millions)
Unvested at January 1, 2020 | ​ | 859,005 | ​ | $ | 86.40 | ​ | ​ | ​
Granted | ​ | 540,547 | ​ | ​ | 82.81 | ​ | ​ | ​
Vested | ​ | (369,990) | ​ | ​ | 84.31 | ​ | ​ | ​
Canceled or forfeited | ​ | (33,842) | ​ | ​ | 85.21 | ​ | ​ | ​
Unvested at December 31, 2020 | ​ | 995,720 | ​ | $ | 85.27 | ​ | $ | 119.2

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- Definition 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. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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