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Earnings Per Common Share and Share Awards Schedule of Weighted Average Grant Date Fair Value of Stock Awards Plans (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Earnings Per Share [Abstract] |  |  |
Weighted average market price | $ 188.71 | $ 192.71 | $ 93.87
Weighted average grant-date fair value | $ 78.61 | $ 55.40 | $ 28.75

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Weighted-Average Market Price + References No definition available. + Details
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- References No definition available. + Details
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