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Stock-Based Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based compensation plans |  |  |
Shares authorized for future grant | 1,475,547 |  |
Additional share-based compensation disclosures |  |  |
Proceed from option exercises | $ 2.8 | $ 5.2 | $ 37.5
Stock options |  |  |
Number of shares |  |  |
Outstanding at the beginning of the year (in shares) | 75,275 | 180,680 | 934,325
Exercised (in shares) | (48,275) | (98,405) | (753,645)
Expired or forfeited (in shares) | (1,000) | (7,000) |
Outstanding at the end of the year (in shares) | 26,000 | 75,275 | 180,680
Exercisable at the end of the year (in shares) | 26,000 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year, Weighted Average Exercise Price (in dollars per share) | $ 52.30 | $ 52.61 | $ 50.26
Exercised, Weighted Average Exercise Price (in dollars per share) | 57.91 | 52.41 | 49.70
Expired or forfeited, Weighted Average Exercise Price (in dollars per share) | 55.73 | 58.68 |
Outstanding at the end of the year, Weighted Average Exercise Price (in dollars per share) | 41.76 | $ 52.30 | $ 52.61
Exercisable at the end of the year, Weighted Average Exercise Price (in dollars per share) | $ 41.76 |  |
Weighted Average Remaining Contractual Term |  |  |
Weighted Average Remaining Contractual Term, stock options outstanding (in years) | 10 months 24 days |  |
Weighted Average Remaining Contractual Term, stock options exercisable (in years) | 10 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Aggregate Intrinsic Value, options outstanding | $ 0.8 |  |
Aggregate Intrinsic Value, options exercisable | $ 0.8 |  |
Changes in non-vested stock options |  |  |
Non-vested | 0 | 0 |
Additional share-based compensation disclosures |  |  |
Proceed from option exercises | $ 2.8 | $ 5.2 | $ 37.5
Total intrinsic value of all options exercised | 1.6 | 2.8 | 16.3
Tax benefit realized from option and RSU exercises | $ 4.9 | $ 8.4 | $ 14.3
Stock options | Non-employee director |  |  |
Additional share-based compensation disclosures |  |  |
Vesting period (in years) | 1 year |  |
Options with ten-year term | Non-employee director |  |  |
Additional share-based compensation disclosures |  |  |
Award expiration term (in years) | 10 years |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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