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Share-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 192 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Number of shares |  |  |  |
Exercisable at the end of the period (in shares) |  | 140,115 |  |
Stock Options |  |  |  |
Number of shares |  |  |  |
Outstanding at the beginning of the period (in shares) | 213,866 | 218,689 | 246,535 |
Granted (in shares) |  | 34,407 | 33,634 |
Exercised (in shares) | (36,978) | (33,424) | (59,480) |
Forfeited (in shares) |  | (5,806) | (2,000) |
Outstanding at the end of the period (in shares) | 176,888 | 213,866 | 218,689 | 176,888
Exercisable at the end of the period (in shares) | 131,216 | 140,115 | 148,702 | 131,216
Weighted-Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 61.28 | $ 52.75 | $ 42.53 |
Granted (in dollars per share) |  | 91.05 | 91.23 |
Exercised (in dollars per share) | 33.26 | 30.88 | 33.03 |
Forfeited (in dollars per share) |  | 91.35 | 26.01 |
Outstanding at the end of the period (in dollars per share) | 67.14 | 61.28 | 52.75 | $ 67.14
Exercisable at the end of the period (in dollars per share) | $ 60.12 | 49.41 | 41.62 | $ 60.12
Weighted-average fair value of options granted during the year (in dollars per share) |  | $ 28.01 | $ 35.42 |
Aggregate Intrinsic Value |  |  |  |
Outstanding at the end of the period | $ 3.7 | $ 1.9 | $ 7.7 | $ 3.7
Exercisable at the end of the period | 3.6 | 1.9 | 6.8 | $ 3.6
Exercised at the end of the period | $ 1.4 | $ 2.0 | $ 3.3 |
Incentive stock options | Maximum |  |  |  |
Share-Based Compensation |  |  |  |
Vesting period | 4 years |  |  |
2019 plan |  |  |  |
Share-Based Compensation |  |  |  |
Number of shares registered | 1,000,000 |  |  | 1,000,000
2004 plan |  |  |  |
Number of shares |  |  |  |
Granted (in shares) |  |  |  | 0
Plan 2004 And 2012 | Incentive stock options |  |  |  |
Share-Based Compensation |  |  |  |
Vesting percentage | 25.00% |  |  |
Expiration period | 10 years |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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